content: Cleanup class/struct forward declarations

content/public/test/web_contents_tester.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_PUBLIC_TEST_WEB_CONTENTS_TESTER_H_
 #define CONTENT_PUBLIC_TEST_WEB_CONTENTS_TESTER_H_
 
 #include <string>
 
 #include "content/public/browser/site_instance.h"
 #include "ui/base/page_transition_types.h"
 
 class GURL;
 
 namespace content {
 
 class BrowserContext;
 class NavigationData;
 class NavigationHandle;
 class RenderFrameHost;
-class RenderViewHost;
 class WebContents;
 struct Referrer;
 
 // This interface allows embedders of content/ to write tests that depend on a
 // test version of WebContents.  This interface can be retrieved from any
 // WebContents that was retrieved via a call to
 // RenderViewHostTestHarness::GetWebContents() (directly or indirectly) or
 // constructed explicitly via CreateTestWebContents.
 //
 // Tests within content/ can directly static_cast WebContents objects retrieved
@@ skipping 91 matching lines @@
       std::unique_ptr<NavigationData> navigation_data) = 0;
 
   // Returns headers that were passed in the previous SaveFrameWithHeaders(...)
   // call.
   virtual const std::string& GetSaveFrameHeaders() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_WEB_CONTENTS_TESTER_H_