Backed out changeset 2752efeb2fdd (Bug 535004: Check if we've fired an unload event before calling OnPageShow, in DocumentViewerImpl::LoadComplete) because the NS_ABORT_IF_FALSE that it added is firing in reftest and crashtest, at least on Linux.

content/base/src/nsDocument.cpp

@@ -3609,11 +3609,6 @@ nsDocument::SetScriptGlobalObject(nsIScriptGlobalObject *aScriptGlobalObject)
                  "Script global object must be an inner window!");
   }
 #endif
-  NS_ABORT_IF_FALSE(aScriptGlobalObject || !mAnimationController ||
-                    mAnimationController->IsPausedByType(
-                        nsSMILTimeContainer::PAUSE_PAGEHIDE |
-                        nsSMILTimeContainer::PAUSE_BEGIN),
-                    "Clearing window pointer while animations are unpaused");
 
   if (mScriptGlobalObject && !aScriptGlobalObject) {
     // We're detaching from the window.  We need to grab a pointer to

layout/base/nsDocumentViewer.cpp

@@ -1067,9 +1067,10 @@ DocumentViewerImpl::LoadComplete(nsresult aStatus)
     window = mDocument->GetWindow();
     if (window) {
       nsIDocShell *docShell = window->GetDocShell();
-      PRBool isInUnload;
-      if (docShell && NS_SUCCEEDED(docShell->GetIsInUnload(&isInUnload)) &&
-          !isInUnload) {
+      PRBool beingDestroyed;
+      if (docShell &&
+          NS_SUCCEEDED(docShell->IsBeingDestroyed(&beingDestroyed)) &&
+          !beingDestroyed) {
         mDocument->OnPageShow(restoring, nsnull);
       }
     }