Remove NOTIFICATION_WEB_CONTENTS_VISIBILITY_CHANGED from browser plugin.

content/browser/browser_plugin/test_browser_plugin_guest.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_BROWSER_PLUGIN_TEST_BROWSER_PLUGIN_GUEST_H_
 #define CONTENT_BROWSER_BROWSER_PLUGIN_TEST_BROWSER_PLUGIN_GUEST_H_
 
 #include "base/compiler_specific.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/public/test/test_utils.h"
 #include "ui/gfx/size.h"
 
 namespace content {
 
 class RenderProcessHost;
 class RenderViewHost;
 class WebContentsImpl;
 
 // Test class for BrowserPluginGuest.
 //
 // Provides utilities to wait for certain state/messages in BrowserPluginGuest
 // to be used in tests.
 class TestBrowserPluginGuest : public BrowserPluginGuest {
  public:
   TestBrowserPluginGuest(int instance_id, WebContentsImpl* web_contents);
   virtual ~TestBrowserPluginGuest();
 
   WebContentsImpl* web_contents() const;
 
-  // NotificationObserver method override.
-  virtual void Observe(int type,
-                       const NotificationSource& source,
-                       const NotificationDetails& details) OVERRIDE;
-
   // Overridden methods from BrowserPluginGuest to intercept in test objects.
   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
   virtual void OnHandleInputEvent(int instance_id,
                                   const gfx::Rect& guest_window_rect,
                                   const WebKit::WebInputEvent* event) OVERRIDE;
   virtual void OnSetFocus(int instance_id, bool focused) OVERRIDE;
   virtual void OnTakeFocus(bool reverse) OVERRIDE;
   virtual void SetDamageBuffer(
       const BrowserPluginHostMsg_ResizeGuest_Params& params) OVERRIDE;
   virtual void DidStopLoading(RenderViewHost* render_view_host) OVERRIDE;
 
+  // Overridden from WebContentsObserver.
+  virtual void WasHidden() OVERRIDE;
+
   // Test utilities to wait for a event we are interested in.
   // Waits until UpdateRect message is sent from the guest, meaning it is
   // ready/rendered.
   void WaitForUpdateRectMsg();
   void ResetUpdateRectCount();
   // Waits until a guest receives a damage buffer of the specified |size|.
   void WaitForDamageBufferWithSize(const gfx::Size& size);
   // Waits for focus to reach this guest.
   void WaitForFocus();
   // Waits for blur to reach this guest.
@@ skipping 43 matching lines @@
   scoped_refptr<MessageLoopRunner> input_message_loop_runner_;
   scoped_refptr<MessageLoopRunner> load_stop_message_loop_runner_;
   scoped_refptr<MessageLoopRunner> auto_view_size_message_loop_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(TestBrowserPluginGuest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_TEST_BROWSER_PLUGIN_GUEST_H_