Remove RenderWidgetHostView*::DidUpdateBackingStore.

content/browser/frame_host/render_widget_host_view_child_frame.cc

 // Copyright 2014 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/frame_host/render_widget_host_view_child_frame.h"
 
 #include "content/browser/frame_host/cross_process_frame_connector.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/view_messages.h"
@@ skipping 102 matching lines @@
 }
 
 #if defined(OS_MACOSX) || defined(USE_AURA)
 void RenderWidgetHostViewChildFrame::ImeCompositionRangeChanged(
     const gfx::Range& range,
     const std::vector<gfx::Rect>& character_bounds) {
   NOTREACHED();
 }
 #endif
 
-void RenderWidgetHostViewChildFrame::DidUpdateBackingStore(
-    const gfx::Rect& scroll_rect,
-    const gfx::Vector2d& scroll_delta,
-    const std::vector<gfx::Rect>& copy_rects,
-    const std::vector<ui::LatencyInfo>& latency_info) {
-  NOTREACHED();
-}
-
 void RenderWidgetHostViewChildFrame::WasShown() {
   if (!host_->is_hidden())
     return;
   host_->WasShown();
 }
 
 void RenderWidgetHostViewChildFrame::WasHidden() {
   if (host_->is_hidden())
     return;
   host_->WasHidden();
@@ skipping 213 matching lines @@
     const {
   return NULL;
 }
 #endif // defined(OS_WIN)
 
 SkBitmap::Config RenderWidgetHostViewChildFrame::PreferredReadbackFormat() {
   return SkBitmap::kARGB_8888_Config;
 }
 
 }  // namespace content