Changing scroll and view state in onpopstate shouldn't overwrite back/forward state restore

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 3293 matching lines @@
         frame_view->LayoutViewportScrollableArea();
 
     if (!scrollable_area->GetScrollOffset().IsZero())
       scrollable_area->SetScrollOffset(ScrollOffset(), kProgrammaticScroll);
   }
 
   if (Document* document =
           ToLocalFrame(GetPage()->MainFrame())->GetDocument()) {
     if (DocumentLoader* loader = document->Loader()) {
       if (HistoryItem* item = loader->GetHistoryItem())
-        item->SetDidSaveScrollOrScaleState(false);
+        item->ClearViewState();
     }
   }
 
   GetPageScaleConstraintsSet().SetNeedsReset(true);
 }
 
 void WebViewImpl::PerformMediaPlayerAction(const WebMediaPlayerAction& action,
                                            const WebPoint& location) {
   HitTestResult result = HitTestResultForViewportPos(location);
   Node* node = result.InnerNode();
@@ skipping 820 matching lines @@
   if (focused_frame->LocalFrameRoot() != MainFrameImpl()->GetFrame())
     return nullptr;
   return focused_frame;
 }
 
 LocalFrame* WebViewImpl::FocusedLocalFrameAvailableForIme() const {
   return ime_accept_events_ ? FocusedLocalFrameInWidget() : nullptr;
 }
 
 }  // namespace blink