diff --git a/mozilla/layout/generic/nsObjectFrame.cpp b/mozilla/layout/generic/nsObjectFrame.cpp
index b93996c0016..76d21ac4bd5 100644
--- a/mozilla/layout/generic/nsObjectFrame.cpp
+++ b/mozilla/layout/generic/nsObjectFrame.cpp
@@ -262,8 +262,6 @@ public:
 
   NS_IMETHOD GetValue(nsPluginInstancePeerVariable variable, void *value);
 
-  NS_IMETHOD PluginNotAvailable(const char *aMimeType);
-
   //nsIPluginTagInfo interface
 
   NS_IMETHOD GetAttributes(PRUint16& n, const char*const*& names,
@@ -1921,12 +1919,6 @@ NS_IMETHODIMP nsPluginInstanceOwner::GetValue(nsPluginInstancePeerVariable varia
   return rv;
 }
 
-NS_IMETHODIMP
-nsPluginInstanceOwner::PluginNotAvailable(const char *aMimeType)
-{
-  return NS_OK;
-}
-
 NS_IMETHODIMP nsPluginInstanceOwner::GetTagType(nsPluginTagType *result)
 {
   NS_ENSURE_ARG_POINTER(result);
diff --git a/mozilla/modules/plugin/base/public/nsIPluginInstanceOwner.idl b/mozilla/modules/plugin/base/public/nsIPluginInstanceOwner.idl
index 5777d12282a..0cb2fd425ed 100644
--- a/mozilla/modules/plugin/base/public/nsIPluginInstanceOwner.idl
+++ b/mozilla/modules/plugin/base/public/nsIPluginInstanceOwner.idl
@@ -47,7 +47,7 @@ interface nsIDocument;
 
 [ref] native nsIPluginInstanceRef(nsIPluginInstance *);
 
-[uuid(18270870-32f1-11d2-a830-0040959a28c9)]
+[uuid(2e6cc23b-7d4e-4b0a-ad45-f2281c937f5c)]
 interface nsIPluginInstanceOwner : nsISupports
 {
   /**
@@ -128,9 +128,4 @@ interface nsIPluginInstanceOwner : nsISupports
    * Get the specified variable
    */
   void getValue(in nsPluginInstancePeerVariable aVariable, in voidPtr aValue);
-
-  /**
-   * Inform the owner that no plugin for the given mime type was found.
-   */
-  void pluginNotAvailable(in string aMimeType);
 };
diff --git a/mozilla/modules/plugin/base/src/nsPluginHostImpl.cpp b/mozilla/modules/plugin/base/src/nsPluginHostImpl.cpp
index e0be39e93b5..913e697f0e9 100644
--- a/mozilla/modules/plugin/base/src/nsPluginHostImpl.cpp
+++ b/mozilla/modules/plugin/base/src/nsPluginHostImpl.cpp
@@ -3857,11 +3857,6 @@ NS_IMETHODIMP nsPluginHostImpl::TrySetUpPluginInstance(const char *aMimeType,
     if (fileExtension.IsEmpty() ||
         !(pluginTag = FindPluginEnabledForExtension(fileExtension.get(),
                                                     mimetype))) {
-
-      if (mDefaultPluginDisabled) {
-        aOwner->PluginNotAvailable(aMimeType ? aMimeType : mimetype);
-      }
-
       return NS_ERROR_FAILURE;
     }
   }