Revert of Revert of Make start/stop loading notifications per-frame

public/web/WebViewClient.h

 /*
  * Copyright (C) 2009 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 128 matching lines @@
 
     // Called to retrieve the provider of desktop notifications.
     virtual WebNotificationPresenter* notificationPresenter() { return 0; }
 
     // This method enumerates all the files in the path. It returns immediately
     // and asynchronously invokes the WebFileChooserCompletion with all the
     // files in the directory. Returns false if the WebFileChooserCompletion
     // will never be called.
     virtual bool enumerateChosenDirectory(const WebString& path, WebFileChooserCompletion*) { return false; }
 
-    // Navigational --------------------------------------------------------
-
-    // These notifications bracket any loading that occurs in the WebView.
-    virtual void didStartLoading(bool toDifferentDocument) { }
-    virtual void didStopLoading() { }
-
-    // Notification that some progress was made loading the current page.
-    // loadProgress is a value between 0 (nothing loaded) and 1.0 (frame fully
-    // loaded).
-    virtual void didChangeLoadProgress(WebLocalFrame*, double loadProgress) { }
 
     // Editing -------------------------------------------------------------
 
     // These methods allow the client to intercept and overrule editing
     // operations.
     virtual void didCancelCompositionOnSelectionChange() { }
     virtual void didChangeContents() { }
     virtual void didExecuteCommand(const WebString& commandName) { }
 
     // This method is called in response to WebView's handleInputEvent()
@@ skipping 239 matching lines @@
     // Informs the browser that the draggable regions have been updated.
     virtual void draggableRegionsChanged() { }
 
 protected:
     ~WebViewClient() { }
 };
 
 } // namespace blink
 
 #endif