Only scroll on main if the targeted frames need to scroll on main

third_party/WebKit/Source/core/page/Page.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 153 matching lines @@
   PointerLockController& pointerLockController() const {
     return *m_pointerLockController;
   }
   ValidationMessageClient& validationMessageClient() const {
     return *m_validationMessageClient;
   }
   void setValidationMessageClient(ValidationMessageClient*);
 
   ScrollingCoordinator* scrollingCoordinator();
 
-  String mainThreadScrollingReasonsAsText();
   ClientRectList* nonFastScrollableRects(const LocalFrame*);
 
   Settings& settings() const { return *m_settings; }
 
   UseCounter& useCounter() { return m_useCounter; }
   Deprecation& deprecation() { return m_deprecation; }
   HostsUsingFeatures& hostsUsingFeatures() { return m_hostsUsingFeatures; }
 
   void setTabKeyCyclesThroughElements(bool b) {
     m_tabKeyCyclesThroughElements = b;
@@ skipping 103 matching lines @@
   // Page.
   // FIXME: Most of the members of Page should move onto FrameHost.
   Member<FrameHost> m_frameHost;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT Supplement<Page>;
 
 }  // namespace blink
 
 #endif  // Page_h