Maintain minimal error response.

content/browser/renderer_host/render_widget_host_view_aura.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_view_aura.h"
 
 #include <set>
 
 #include "base/auto_reset.h"
 #include "base/basictypes.h"
@@ skipping 1046 matching lines @@
   if (touch_editing_client_) {
     touch_editing_client_->OnSelectionOrCursorChanged(
         anchor_bound, focus_bound);
   }
 }
 
 void RenderWidgetHostViewAura::CopyFromCompositingSurface(
     const gfx::Rect& src_subrect,
     const gfx::Size& dst_size,
     ReadbackRequestCallback& callback,
-    const SkColorType color_type) {
+    const SkColorType preferred_color_type) {
   delegated_frame_host_->CopyFromCompositingSurface(
-      src_subrect, dst_size, callback, color_type);
+      src_subrect, dst_size, callback, preferred_color_type);
 }
 
 void RenderWidgetHostViewAura::CopyFromCompositingSurfaceToVideoFrame(
       const gfx::Rect& src_subrect,
       const scoped_refptr<media::VideoFrame>& target,
       const base::Callback<void(bool)>& callback) {
   delegated_frame_host_->CopyFromCompositingSurfaceToVideoFrame(
       src_subrect, target, callback);
 }
 
@@ skipping 1598 matching lines @@
     NativeWebKeyboardEvent copy_event(event);
     copy_event.match_edit_command = true;
     host_->ForwardKeyboardEvent(copy_event);
     return;
   }
 #endif
 
   host_->ForwardKeyboardEvent(event);
 }
 
-SkColorType RenderWidgetHostViewAura::PreferredReadbackFormat() {
-  return kN32_SkColorType;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // DelegatedFrameHost, public:
 
 ui::Layer* RenderWidgetHostViewAura::DelegatedFrameHostGetLayer() const {
   return window_->layer();
 }
 
 bool RenderWidgetHostViewAura::DelegatedFrameHostIsVisible() const {
   return !host_->is_hidden();
 }
@@ skipping 62 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewBase, public:
 
 // static
 void RenderWidgetHostViewBase::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content