[cc] Unify static create method of ResourceUpdate

cc/resources/resource_update.cc

-// Copyright 2012 The Chromium Authors. All rights reserved.
+// 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 "cc/resources/resource_update.h"
 
 #include "base/logging.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkDevice.h"
 
 namespace cc {
 
 ResourceUpdate ResourceUpdate::Create(PrioritizedResource* texture,
                                       const SkBitmap* bitmap,
                                       gfx::Rect content_rect,
                                       gfx::Rect source_rect,
                                       gfx::Vector2d dest_offset) {
   CHECK(content_rect.Contains(source_rect));
   ResourceUpdate update;
   update.texture = texture;
   update.bitmap = bitmap;
   update.content_rect = content_rect;
   update.source_rect = source_rect;
   update.dest_offset = dest_offset;
   return update;
 }
 
-ResourceUpdate ResourceUpdate::CreateFromCanvas(
-    PrioritizedResource* resource,
-    const skia::RefPtr<SkCanvas>& canvas,
-    gfx::Rect content_rect,
-    gfx::Rect source_rect,
-    gfx::Vector2d dest_offset) {
-  CHECK(content_rect.Contains(source_rect));
-  ResourceUpdate update;
-  update.texture = resource;
-  update.canvas = canvas;
-  update.bitmap = &canvas->getDevice()->accessBitmap(false);
-  update.content_rect = content_rect;
-  update.source_rect = source_rect;
-  update.dest_offset = dest_offset;
-  return update;
-}
-
 ResourceUpdate::ResourceUpdate()
     : texture(NULL),
       bitmap(NULL) {}
 
 ResourceUpdate::~ResourceUpdate() {}
 
 }  // namespace cc