Rewrite scoped_ptr<T>(NULL) to use the default ctor in cc/.

cc/layers/texture_layer_unittest.cc

 // Copyright 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 "cc/layers/texture_layer.h"
 
 #include <string>
 
 #include "base/callback.h"
 #include "cc/base/thread.h"
@@ skipping 15 matching lines @@
 using ::testing::AtLeast;
 using ::testing::AnyNumber;
 
 namespace cc {
 namespace {
 
 class MockLayerTreeHost : public LayerTreeHost {
  public:
   explicit MockLayerTreeHost(LayerTreeHostClient* client)
       : LayerTreeHost(client, LayerTreeSettings()) {
-    Initialize(scoped_ptr<Thread>(NULL));
+    Initialize(scoped_ptr<Thread>());
   }
 
   MOCK_METHOD0(AcquireLayerTextures, void());
   MOCK_METHOD0(SetNeedsCommit, void());
 };
 
 class TextureLayerTest : public testing::Test {
  public:
   TextureLayerTest()
       : fake_client_(
@@ skipping 670 matching lines @@
   base::Lock lock_;
   unsigned expected_used_textures_on_commit_;
 };
 
 // The TextureLayerClient does not use mailboxes, so can't use a delegating
 // renderer.
 SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(TextureLayerClientTest);
 
 }  // namespace
 }  // namespace cc