diff --git a/mozilla/extensions/xmlterm/base/mozXMLTerminal.cpp b/mozilla/extensions/xmlterm/base/mozXMLTerminal.cpp
index fe269aeaa7b..1aec270ac6a 100644
--- a/mozilla/extensions/xmlterm/base/mozXMLTerminal.cpp
+++ b/mozilla/extensions/xmlterm/base/mozXMLTerminal.cpp
@@ -839,12 +839,3 @@ mozXMLTerminal::OnEndURLLoad(nsIDocumentLoader* loader,
   Activate();
   return NS_OK;
 }
-
-NS_IMETHODIMP
-mozXMLTerminal::HandleUnknownContentType(nsIDocumentLoader* loader, 
-                                           nsIChannel* channel,
-                                           const char *aContentType,
-                                           const char *aCommand )
-{
-   return NS_OK;
-}
diff --git a/mozilla/extensions/xmlterm/geckoterm/mozSimpleContainer.cpp b/mozilla/extensions/xmlterm/geckoterm/mozSimpleContainer.cpp
index 341819d6418..e71453cc2bc 100644
--- a/mozilla/extensions/xmlterm/geckoterm/mozSimpleContainer.cpp
+++ b/mozilla/extensions/xmlterm/geckoterm/mozSimpleContainer.cpp
@@ -236,15 +236,6 @@ NS_IMETHODIMP mozSimpleContainer::OnEndURLLoad(nsIDocumentLoader *aLoader,
 }
 
 
-NS_IMETHODIMP mozSimpleContainer::HandleUnknownContentType(
-               nsIDocumentLoader *aLoader,
-               nsIChannel *aChannel,
-               const char *aContentType, const char *aCommand)
-{
-  return NS_OK;
-}
-
-
 /** Resizes container to new dimensions
  * @param width new window width (pixels)
  * @param height new window height (pixels)
diff --git a/mozilla/htmlparser/robot/nsDebugRobot.cpp b/mozilla/htmlparser/robot/nsDebugRobot.cpp
index 7ff287e947e..0740cc09bb5 100644
--- a/mozilla/htmlparser/robot/nsDebugRobot.cpp
+++ b/mozilla/htmlparser/robot/nsDebugRobot.cpp
@@ -137,29 +137,7 @@ public:
   NS_DECL_ISUPPORTS
 
   // nsIDocumentLoaderObserver
-  NS_IMETHOD OnStartDocumentLoad(nsIDocumentLoader* loader, 
-                                 nsIURI* aURL, 
-                                 const char* aCommand);
-  NS_IMETHOD OnEndDocumentLoad(nsIDocumentLoader* loader,
-                               nsIChannel* channel,
-                               nsresult aStatus);
-  NS_IMETHOD OnStartURLLoad(nsIDocumentLoader* loader,
-                            nsIChannel* channel);
-  NS_IMETHOD OnProgressURLLoad(nsIDocumentLoader* loader,
-                               nsIChannel* channel,
-                               PRUint32 aProgress, 
-                               PRUint32 aProgressMax);
-  NS_IMETHOD OnStatusURLLoad(nsIDocumentLoader* loader,
-                             nsIChannel* channel,
-                             nsString& aMsg);
-  NS_IMETHOD OnEndURLLoad(nsIDocumentLoader* loader,
-                          nsIChannel* channel,
-                          nsresult aStatus);
-  NS_IMETHOD HandleUnknownContentType( nsIDocumentLoader* loader,
-                                       nsIChannel* channel,
-                                       const char *aContentType,
-                                       const char *aCommand );
-
+  NS_DECL_NSIDOCUMENTLOADEROBSERVER
 };
 
 // document loader observer implementation
@@ -213,15 +191,6 @@ CStreamListener::OnEndURLLoad(nsIDocumentLoader* loader,
   return NS_OK;
 }
 
-NS_IMETHODIMP
-CStreamListener::HandleUnknownContentType(nsIDocumentLoader* loader,
-                                          nsIChannel* channel,
-                                          const char *aContentType,
-                                          const char *aCommand)
-{
-  return NS_OK;
-}
-
 
 nsresult CStreamListener::QueryInterface(const nsIID& aIID, void** aInstancePtr)  
 {                                                                        
diff --git a/mozilla/parser/htmlparser/robot/nsDebugRobot.cpp b/mozilla/parser/htmlparser/robot/nsDebugRobot.cpp
index 7ff287e947e..0740cc09bb5 100644
--- a/mozilla/parser/htmlparser/robot/nsDebugRobot.cpp
+++ b/mozilla/parser/htmlparser/robot/nsDebugRobot.cpp
@@ -137,29 +137,7 @@ public:
   NS_DECL_ISUPPORTS
 
   // nsIDocumentLoaderObserver
-  NS_IMETHOD OnStartDocumentLoad(nsIDocumentLoader* loader, 
-                                 nsIURI* aURL, 
-                                 const char* aCommand);
-  NS_IMETHOD OnEndDocumentLoad(nsIDocumentLoader* loader,
-                               nsIChannel* channel,
-                               nsresult aStatus);
-  NS_IMETHOD OnStartURLLoad(nsIDocumentLoader* loader,
-                            nsIChannel* channel);
-  NS_IMETHOD OnProgressURLLoad(nsIDocumentLoader* loader,
-                               nsIChannel* channel,
-                               PRUint32 aProgress, 
-                               PRUint32 aProgressMax);
-  NS_IMETHOD OnStatusURLLoad(nsIDocumentLoader* loader,
-                             nsIChannel* channel,
-                             nsString& aMsg);
-  NS_IMETHOD OnEndURLLoad(nsIDocumentLoader* loader,
-                          nsIChannel* channel,
-                          nsresult aStatus);
-  NS_IMETHOD HandleUnknownContentType( nsIDocumentLoader* loader,
-                                       nsIChannel* channel,
-                                       const char *aContentType,
-                                       const char *aCommand );
-
+  NS_DECL_NSIDOCUMENTLOADEROBSERVER
 };
 
 // document loader observer implementation
@@ -213,15 +191,6 @@ CStreamListener::OnEndURLLoad(nsIDocumentLoader* loader,
   return NS_OK;
 }
 
-NS_IMETHODIMP
-CStreamListener::HandleUnknownContentType(nsIDocumentLoader* loader,
-                                          nsIChannel* channel,
-                                          const char *aContentType,
-                                          const char *aCommand)
-{
-  return NS_OK;
-}
-
 
 nsresult CStreamListener::QueryInterface(const nsIID& aIID, void** aInstancePtr)  
 {                                                                        
diff --git a/mozilla/uriloader/base/nsIDocumentLoaderObserver.idl b/mozilla/uriloader/base/nsIDocumentLoaderObserver.idl
index ae8e8078cd7..86c52fde5ac 100644
--- a/mozilla/uriloader/base/nsIDocumentLoaderObserver.idl
+++ b/mozilla/uriloader/base/nsIDocumentLoaderObserver.idl
@@ -83,15 +83,6 @@ interface nsIDocumentLoaderObserver : nsISupports
    * Notify the observer that the specified nsIURI has finished loading.
    */
   void onEndURLLoad(in nsIDocumentLoader aLoader, in nsIChannel aChannel, in unsigned long aStatus);
-
-  /**
-   * Notify the observer that some content of unknown type has been
-   * encountered...
-   */
-  void handleUnknownContentType(in nsIDocumentLoader aLoader,
-                                in nsIChannel aChannel,
-                                in string aContentType,
-                                in string aCommand);
 };
 
 /* the following is a transition define. nsIDocumentLoaderObserver wasn't scriptable and now it is.
@@ -100,4 +91,4 @@ interface nsIDocumentLoaderObserver : nsISupports
 
 %{C++
 #define NS_IDOCUMENT_LOADER_OBSERVER_IID NS_IDOCUMENTLOADEROBSERVER_IID
-%}
\ No newline at end of file
+%}