OOPIF: Clear focused frame before advancing to remote frame.

third_party/WebKit/Source/core/page/FocusController.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 959 matching lines @@
   ScopedFocusNavigation scope =
       current ? ScopedFocusNavigation::CreateFor(*current)
               : ScopedFocusNavigation::CreateForDocument(*document);
   Element* element = FindFocusableElementAcrossFocusScopes(type, scope);
   if (!element) {
     // If there's a RemoteFrame on the ancestor chain, we need to continue
     // searching for focusable elements there.
     if (frame->LocalFrameRoot() != frame->Tree().Top()) {
       document->ClearFocusedElement();
       document->SetSequentialFocusNavigationStartingPoint(nullptr);
+      SetFocusedFrame(nullptr);
       ToRemoteFrame(frame->LocalFrameRoot()->Tree().Parent())
           ->AdvanceFocus(type, frame->LocalFrameRoot());
       return true;
     }
 
     // We didn't find an element to focus, so we should try to pass focus to
     // Chrome.
     if (!initial_focus && page_->GetChromeClient().CanTakeFocus(type)) {
       document->ClearFocusedElement();
       document->SetSequentialFocusNavigationStartingPoint(nullptr);
@@ skipping 419 matching lines @@
     it->FocusedFrameChanged();
 }
 
 DEFINE_TRACE(FocusController) {
   visitor->Trace(page_);
   visitor->Trace(focused_frame_);
   visitor->Trace(focus_changed_observers_);
 }
 
 }  // namespace blink