Move dispatchBeforeUnloadEvent to WebFrame, part 1/3.

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 2410 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->mainFrame()->loader().reload(NormalReload, KURL(), newEncodingName);
 }
 
 bool WebViewImpl::dispatchBeforeUnloadEvent()
 {
-    // FIXME: This should really cause a recursive depth-first walk of all
-    // frames in the tree, calling each frame's onbeforeunload.  At the moment,
-    // we're consistent with Safari 3.1, not IE/FF.
-    LocalFrame* frame = m_page->mainFrame();
+    WebFrame* frame = mainFrame();
     if (!frame)
         return true;
 
-    return frame->loader().shouldClose();
+    return frame->dispatchBeforeUnloadEvent();
 }
 
 void WebViewImpl::dispatchUnloadEvent()
 {
     // Run unload handlers.
     m_page->mainFrame()->loader().closeURL();
 }
 
 WebFrame* WebViewImpl::mainFrame()
 {
@@ skipping 1554 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