diff --git a/mozilla/content/base/src/nsContentSink.cpp b/mozilla/content/base/src/nsContentSink.cpp
index 9a89625abf8..1f29329528d 100644
--- a/mozilla/content/base/src/nsContentSink.cpp
+++ b/mozilla/content/base/src/nsContentSink.cpp
@@ -154,10 +154,25 @@ NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsContentSink)
   NS_INTERFACE_MAP_ENTRY(nsICSSLoaderObserver)
   NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
   NS_INTERFACE_MAP_ENTRY(nsIScriptLoaderObserver)
+  NS_INTERFACE_MAP_ENTRY(nsIDocumentObserver)
+  NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
+  NS_INTERFACE_MAP_ENTRY(nsITimerCallback)
   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIScriptLoaderObserver)
 NS_INTERFACE_MAP_END
 
-NS_IMPL_CYCLE_COLLECTION_2(nsContentSink, mDocument, mParser)
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsContentSink)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsContentSink)
+  if (tmp->mDocument) {
+    tmp->mDocument->RemoveObserver(tmp);
+  }
+NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mDocument)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mParser)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsContentSink)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mDocument)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mParser)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
 
 nsContentSink::nsContentSink()
 {
@@ -181,6 +196,11 @@ nsContentSink::nsContentSink()
 
 nsContentSink::~nsContentSink()
 {
+  if (mDocument) {
+    // Remove ourselves just to be safe, though we really should have
+    // been removed in DidBuildModel if everything worked right.
+    mDocument->RemoveObserver(this);
+  }
 }
 
 nsresult
diff --git a/mozilla/content/html/document/src/nsHTMLContentSink.cpp b/mozilla/content/html/document/src/nsHTMLContentSink.cpp
index 326dc861c6b..686c2efe9d3 100644
--- a/mozilla/content/html/document/src/nsHTMLContentSink.cpp
+++ b/mozilla/content/html/document/src/nsHTMLContentSink.cpp
@@ -1570,11 +1570,6 @@ HTMLContentSink::~HTMLContentSink()
   NS_IF_RELEASE(mBody);
   NS_IF_RELEASE(mRoot);
 
-  if (mDocument) {
-    // Remove ourselves just to be safe, though we really should have
-    // been removed in DidBuildModel if everything worked right.
-    mDocument->RemoveObserver(this);
-  }
   NS_IF_RELEASE(mHTMLDocument);
 
   if (mNotificationTimer) {
@@ -1615,22 +1610,16 @@ HTMLContentSink::~HTMLContentSink()
 }
 
 #if DEBUG
-NS_IMPL_ISUPPORTS_INHERITED6(HTMLContentSink,
+NS_IMPL_ISUPPORTS_INHERITED3(HTMLContentSink,
                              nsContentSink,
                              nsIContentSink,
                              nsIHTMLContentSink,
-                             nsITimerCallback,
-                             nsIDocumentObserver,
-                             nsIMutationObserver,
                              nsIDebugDumpContent)
 #else
-NS_IMPL_ISUPPORTS_INHERITED5(HTMLContentSink,
+NS_IMPL_ISUPPORTS_INHERITED2(HTMLContentSink,
                              nsContentSink,
                              nsIContentSink,
-                             nsIHTMLContentSink,
-                             nsITimerCallback,
-                             nsIDocumentObserver,
-                             nsIMutationObserver)
+                             nsIHTMLContentSink)
 #endif
 
 static PRBool
diff --git a/mozilla/content/xml/document/src/nsXMLContentSink.cpp b/mozilla/content/xml/document/src/nsXMLContentSink.cpp
index dd058b52e8b..b86f3aedc4b 100644
--- a/mozilla/content/xml/document/src/nsXMLContentSink.cpp
+++ b/mozilla/content/xml/document/src/nsXMLContentSink.cpp
@@ -145,12 +145,6 @@ nsXMLContentSink::nsXMLContentSink()
 
 nsXMLContentSink::~nsXMLContentSink()
 {
-  if (mDocument) {
-    // Remove ourselves just to be safe, though we really should have
-    // been removed in DidBuildModel if everything worked right.
-    mDocument->RemoveObserver(this);
-  }
-
   NS_IF_RELEASE(mDocElement);
   if (mText) {
     PR_Free(mText);  //  Doesn't null out, unlike PR_FREEIF
@@ -189,9 +183,6 @@ NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(nsXMLContentSink)
   NS_INTERFACE_MAP_ENTRY(nsIContentSink)
   NS_INTERFACE_MAP_ENTRY(nsIXMLContentSink)
   NS_INTERFACE_MAP_ENTRY(nsIExpatSink)
-  NS_INTERFACE_MAP_ENTRY(nsITimerCallback)
-  NS_INTERFACE_MAP_ENTRY(nsIDocumentObserver)
-  NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
   NS_INTERFACE_MAP_ENTRY(nsITransformObserver)
 NS_INTERFACE_MAP_END_INHERITING(nsContentSink)