content: Remove Lock/Unlock CompositingSurface API from RWH.

content/browser/renderer_host/render_widget_host_impl.cc

 // 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.
 
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 
 #include <set>
 #include <tuple>
@@ skipping 815 matching lines @@
 
   callback.Run(SkBitmap(), content::READBACK_FAILED);
 }
 
 bool RenderWidgetHostImpl::CanCopyFromBackingStore() {
   if (view_)
     return view_->IsSurfaceAvailableForCopy();
   return false;
 }
 
-void RenderWidgetHostImpl::LockBackingStore() {
-  if (view_)
-    view_->LockCompositingSurface();
-}
-
-void RenderWidgetHostImpl::UnlockBackingStore() {
-  if (view_)
-    view_->UnlockCompositingSurface();
-}
-
 #if defined(OS_MACOSX)
 void RenderWidgetHostImpl::PauseForPendingResizeOrRepaints() {
   TRACE_EVENT0("browser",
       "RenderWidgetHostImpl::PauseForPendingResizeOrRepaints");
 
   if (!CanPauseForPendingResizeOrRepaints())
     return;
 
   WaitForSurface();
 }
@@ skipping 1660 matching lines @@
     // different from the receiver's.
     file_system_file.url =
         GURL(storage::GetIsolatedFileSystemRootURIString(
                  file_system_url.origin(), filesystem_id, std::string())
                  .append(register_name));
     file_system_file.filesystem_id = filesystem_id;
   }
 }
 
 }  // namespace content