blink: Cleanup class/struct forward declarations

third_party/WebKit/public/platform/WebFrameScheduler.h

 // Copyright 2015 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 WebFrameScheduler_h
 #define WebFrameScheduler_h
 
 #include "WebCommon.h"
 
 #include <string>
 
 namespace blink {
 
-class WebSecurityOrigin;
 class WebTaskRunner;
 class WebViewScheduler;
 
 class BLINK_PLATFORM_EXPORT WebFrameScheduler {
  public:
   virtual ~WebFrameScheduler() {}
 
   // The scheduler may throttle tasks associated with offscreen frames.
   virtual void setFrameVisible(bool) {}
 
@@ skipping 44 matching lines @@
   virtual void setDocumentParsingInBackground(bool) {}
 
   // Tells the scheduler that the first meaningful paint has occured for this
   // frame.
   virtual void onFirstMeaningfulPaint() {}
 };
 
 }  // namespace blink
 
 #endif  // WebFrameScheduler_h