Cleanup various WebView/WebFrame APIs to properly handle remote frames.

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 2475 matching lines @@
     // Only change override encoding, don't change default encoding.
     // Note that the new encoding must be 0 if it isn't supposed to be set.
     AtomicString newEncodingName;
     if (!encodingName.isEmpty())
         newEncodingName = encodingName;
     m_page->deprecatedLocalMainFrame()->loader().reload(NormalReload, KURL(), newEncodingName);
 }
 
 WebFrame* WebViewImpl::mainFrame()
 {
-    // FIXME: This should be updated so it can return both WebLocalFrames and
-    // WebRemoteFrames. Right now, it only returns WebLocalFrames.
-    return mainFrameImpl();
+    return WebFrame::fromFrame(m_page ? m_page->mainFrame() : 0);
 }
 
 WebFrame* WebViewImpl::findFrameByName(
     const WebString& name, WebFrame* relativeToFrame)
 {
     // FIXME: Either this should only deal with WebLocalFrames or it should move to WebFrame.
     if (!relativeToFrame)
         relativeToFrame = mainFrame();
     Frame* frame = toWebLocalFrameImpl(relativeToFrame)->frame();
     frame = frame->tree().find(name);
@@ skipping 1629 matching lines @@
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return false;
 
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace blink