Simplify detection of new, test-related RenderFrameHosts.

content/shell/browser/layout_test/secondary_test_window_observer.h

 // Copyright 2016 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_SHELL_BROWSER_LAYOUT_TEST_SECONDARY_TEST_WINDOW_OBSERVER_H_
 #define CONTENT_SHELL_BROWSER_LAYOUT_TEST_SECONDARY_TEST_WINDOW_OBSERVER_H_
 
 #include "base/macros.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 namespace content {
 
 class SecondaryTestWindowObserver
     : public WebContentsObserver,
       public WebContentsUserData<SecondaryTestWindowObserver> {
  public:
   ~SecondaryTestWindowObserver() override;
 
   // WebContentsObserver implementation.
   void RenderFrameCreated(RenderFrameHost* render_frame_host) override;
-  void RenderFrameHostChanged(RenderFrameHost* old_host,
-                              RenderFrameHost* new_host) override;
 
  private:
   friend class WebContentsUserData<SecondaryTestWindowObserver>;
   explicit SecondaryTestWindowObserver(WebContents* web_contents);
 
   DISALLOW_COPY_AND_ASSIGN(SecondaryTestWindowObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_BROWSER_LAYOUT_TEST_SECONDARY_TEST_WINDOW_OBSERVER_H_