Remove RenderWidgetHostView*::DidUpdateBackingStore.

content/browser/frame_host/render_widget_host_view_guest.cc

Index: content/browser/frame_host/render_widget_host_view_guest.cc
diff --git a/content/browser/frame_host/render_widget_host_view_guest.cc b/content/browser/frame_host/render_widget_host_view_guest.cc
index c564a282faf1ba75e4fa1c4396ec09666219e4fe..9a9995ee6ff06df0f68fd4fe8441ba3eae450c93 100644
--- a/content/browser/frame_host/render_widget_host_view_guest.cc
+++ b/content/browser/frame_host/render_widget_host_view_guest.cc
@@ -342,14 +342,6 @@ void RenderWidgetHostViewGuest::ImeCompositionRangeChanged(
 }
 #endif
 
-void RenderWidgetHostViewGuest::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 RenderWidgetHostViewGuest::SelectionChanged(const base::string16& text,
                                                  size_t offset,
                                                  const gfx::Range& range) {