Maintain minimal error response.

content/test/test_render_view_host.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/test/test_render_view_host.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/dom_storage/dom_storage_context_wrapper.h"
 #include "content/browser/dom_storage/session_storage_namespace_impl.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
@@ skipping 106 matching lines @@
 void TestRenderWidgetHostView::Destroy() { delete this; }
 
 gfx::Rect TestRenderWidgetHostView::GetViewBounds() const {
   return gfx::Rect();
 }
 
 void TestRenderWidgetHostView::CopyFromCompositingSurface(
     const gfx::Rect& src_subrect,
     const gfx::Size& dst_size,
     ReadbackRequestCallback& callback,
-    const SkColorType color_type) {
-  callback.Run(SkBitmap(), content::READBACK_NOT_SUPPORTED);
+    const SkColorType preferred_color_type) {
+  callback.Run(SkBitmap(), content::READBACK_FAILED);
 }
 
 void TestRenderWidgetHostView::CopyFromCompositingSurfaceToVideoFrame(
     const gfx::Rect& src_subrect,
     const scoped_refptr<media::VideoFrame>& target,
     const base::Callback<void(bool)>& callback) {
   callback.Run(false);
 }
 
 bool TestRenderWidgetHostView::CanCopyToVideoFrame() const {
@@ skipping 170 matching lines @@
 
 TestRenderFrameHost* RenderViewHostImplTestHarness::main_test_rfh() {
   return contents()->GetMainFrame();
 }
 
 TestWebContents* RenderViewHostImplTestHarness::contents() {
   return static_cast<TestWebContents*>(web_contents());
 }
 
 }  // namespace content