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

cc/layers/nine_patch_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/nine_patch_layer.h"
 
 #include "cc/base/thread.h"
 #include "cc/debug/overdraw_metrics.h"
 #include "cc/resources/prioritized_resource_manager.h"
 #include "cc/resources/resource_provider.h"
@@ skipping 14 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>());
   }
 };
 
 class NinePatchLayerTest : public testing::Test {
  public:
   NinePatchLayerTest() : fake_client_(FakeLayerTreeHostClient::DIRECT_3D) {}
 
   cc::Proxy* Proxy() const { return layer_tree_host_->proxy(); }
 
  protected:
@@ skipping 87 matching lines @@
   EXPECT_EQ(1u, queue2.FullUploadSize());
   EXPECT_EQ(0u, queue2.PartialUploadSize());
   params = queue2.TakeFirstFullUpload();
   EXPECT_TRUE(params.texture != NULL);
   EXPECT_EQ(params.texture->resource_manager(),
             layer_tree_host_->contents_texture_manager());
 }
 
 }  // namespace
 }  // namespace cc