Convert HTMLFrameOwnerElement and FocusController to use Frame.

Source/core/dom/TreeScope.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple 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:
  * 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 333 matching lines @@
         if (focusedFrame->tree().parent() == currentFrame)
             return focusedFrame->ownerElement();
     }
     return 0;
 }
 
 Element* TreeScope::adjustedFocusedElement() const
 {
     Document& document = rootNode().document();
     Element* element = document.focusedElement();
+    // FIXME(kenrb): The toLocalFrame() cast should be removed when RemoteFrames can have FrameTrees.

[dcheng, 2014/03/17 18:17:44]

I don't really understand what this comment has to do with the changes here. It
doesn't look like we're doing anything with the frame tree here?

[kenrb, 2014/03/18 20:01:19]

I've expanded the comment. focusedFrameOwnerElement can't be changed to take a
Frame instead of a LocalFrame until FrameTree works with Frames.

     if (!element && document.page())
-        element = focusedFrameOwnerElement(document.page()->focusController().focusedFrame(), document.frame());
+        element = focusedFrameOwnerElement(toLocalFrame(document.page()->focusController().focusedFrame()), document.frame());
     if (!element)
         return 0;
 
     EventPath eventPath(element);
     for (size_t i = 0; i < eventPath.size(); ++i) {
         if (eventPath[i].node() == rootNode()) {
             // eventPath.at(i).target() is one of the followings:
             // - InsertionPoint
             // - shadow host
             // - Document::focusedElement()
@@ skipping 127 matching lines @@
     for (Element* element = ElementTraversal::firstWithin(rootNode()); element; element = ElementTraversal::nextIncludingPseudo(*element)) {
         for (ShadowRoot* root = element->youngestShadowRoot(); root; root = root->olderShadowRoot())
             root->setNeedsStyleRecalcForViewportUnits();
         RenderStyle* style = element->renderStyle();
         if (style && style->hasViewportUnits())
             element->setNeedsStyleRecalc(LocalStyleChange);
     }
 }
 
 } // namespace WebCore