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

cc/layers/delegated_renderer_layer_impl_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/delegated_renderer_layer_impl.h"
 
 #include "cc/base/scoped_ptr_vector.h"
 #include "cc/layers/append_quads_data.h"
 #include "cc/layers/quad_sink.h"
 #include "cc/layers/solid_color_layer_impl.h"
@@ skipping 15 matching lines @@
 #include "cc/trees/single_thread_proxy.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 namespace {
 
 class DelegatedRendererLayerImplTest : public testing::Test {
  public:
   DelegatedRendererLayerImplTest()
-      : proxy_(scoped_ptr<Thread>(NULL)),
+      : proxy_(scoped_ptr<Thread>()),
         always_impl_thread_and_main_thread_blocked_(&proxy_) {
     LayerTreeSettings settings;
     settings.minimum_occlusion_tracking_size = gfx::Size();
 
     host_impl_ = LayerTreeHostImpl::Create(settings,
                                            &client_,
                                            &proxy_,
                                            &stats_instrumentation_);
     host_impl_->InitializeRenderer(CreateFakeOutputSurface());
     host_impl_->SetViewportSize(gfx::Size(10, 10));
@@ skipping 1198 matching lines @@
             root_delegated_shared_quad_state->clip_rect.ToString());
   // Quads came with a clip rect.
   EXPECT_TRUE(root_delegated_shared_quad_state->is_clipped);
 
   host_impl_->DrawLayers(&frame, base::TimeTicks::Now());
   host_impl_->DidDrawAllLayers(frame);
 }
 
 }  // namespace
 }  // namespace cc