[C++11 Allowed Features] Declares a type-safe null pointer converting from NULL to nullptr [part-4]

cc/test/layer_tree_pixel_test.cc

 // Copyright 2013 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/test/layer_tree_pixel_test.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "cc/base/switches.h"
 #include "cc/layers/solid_color_layer.h"
@@ skipping 158 matching lines @@
       border_color);
   layer->AddChild(border_top);
   layer->AddChild(border_left);
   layer->AddChild(border_right);
   layer->AddChild(border_bottom);
   return layer;
 }
 
 scoped_refptr<TextureLayer> LayerTreePixelTest::CreateTextureLayer(
     const gfx::Rect& rect, const SkBitmap& bitmap) {
-  scoped_refptr<TextureLayer> layer = TextureLayer::CreateForMailbox(NULL);
+  scoped_refptr<TextureLayer> layer = TextureLayer::CreateForMailbox(nullptr);
   layer->SetIsDrawable(true);
   layer->SetBounds(rect.size());
   layer->SetPosition(rect.origin());
 
   TextureMailbox texture_mailbox;
   scoped_ptr<SingleReleaseCallback> release_callback;
   CopyBitmapToTextureMailboxAsTexture(
       bitmap, &texture_mailbox, &release_callback);
   layer->SetTextureMailbox(texture_mailbox, release_callback.Pass());
 
   texture_layers_.push_back(layer);
   pending_texture_mailbox_callbacks_++;
   return layer;
 }
 
 void LayerTreePixelTest::RunPixelTest(
     PixelTestType test_type,
     scoped_refptr<Layer> content_root,
     base::FilePath file_name) {
   test_type_ = test_type;
   content_root_ = content_root;
-  readback_target_ = NULL;
+  readback_target_ = nullptr;
   ref_file_ = file_name;
   RunTest(true, false, impl_side_painting_);
 }
 
 void LayerTreePixelTest::RunPixelTestWithReadbackTarget(
     PixelTestType test_type,
     scoped_refptr<Layer> content_root,
     Layer* target,
     base::FilePath file_name) {
   test_type_ = test_type;
@@ skipping 149 matching lines @@
 
   *texture_mailbox = TextureMailbox(mailbox, GL_TEXTURE_2D, sync_point);
   *release_callback = SingleReleaseCallback::Create(
       base::Bind(&LayerTreePixelTest::ReleaseTextureMailbox,
                  base::Unretained(this),
                  base::Passed(&context),
                  texture_id));
 }
 
 }  // namespace cc