Remove some dead code in ThumbnailGenerator.

chrome/test/base/ui_test_utils.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 "chrome/test/base/ui_test_utils.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
@@ skipping 1182 matching lines @@
   bool TakeRenderWidgetSnapshot(RenderWidgetHost* rwh,
                                 const gfx::Size& page_size,
                                 const gfx::Size& desired_size,
                                 SkBitmap* bitmap) WARN_UNUSED_RESULT {
     bitmap_ = bitmap;
     ThumbnailGenerator* generator = g_browser_process->GetThumbnailGenerator();
     generator->MonitorRenderer(rwh, true);
     snapshot_taken_ = false;
     generator->AskForSnapshot(
         rwh,
-        false,  // don't use backing_store
         base::Bind(&SnapshotTaker::OnSnapshotTaken, base::Unretained(this)),
         page_size,
         desired_size);
     ui_test_utils::RunMessageLoop();
     return snapshot_taken_;
   }
 
   bool TakeEntirePageSnapshot(RenderViewHost* rvh,
                               SkBitmap* bitmap) WARN_UNUSED_RESULT {
     const wchar_t* script =
@@ skipping 68 matching lines @@
                int state,
                const base::Closure& followup) {
   if (!followup.is_null())
     ui_controls::SendMouseEventsNotifyWhenDone(button, state, followup);
   else
     ui_controls::SendMouseEvents(button, state);
 }
 
 }  // namespace internal
 }  // namespace ui_test_utils