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

cc/layers/layer_unittest.cc

 // Copyright 2011 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/layer.h"
 
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/base/math_util.h"
 #include "cc/base/thread.h"
 #include "cc/layers/layer_impl.h"
@@ skipping 23 matching lines @@
   } while (false)
 
 
 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(SetNeedsCommit, void());
   MOCK_METHOD0(SetNeedsFullTreeSync, void());
 };
 
 class MockLayerPainter : public LayerPainter {
  public:
   virtual void Paint(SkCanvas* canvas,
                      gfx::Rect content_rect,
@@ skipping 672 matching lines @@
 
   EXPECT_EQ(replica, replica->mask_layer()->parent());
 }
 
 class LayerTreeHostFactory {
  public:
   LayerTreeHostFactory()
       : client_(FakeLayerTreeHostClient::DIRECT_3D) {}
 
   scoped_ptr<LayerTreeHost> Create() {
-    return LayerTreeHost::Create(&client_,
-                                 LayerTreeSettings(),
-                                 scoped_ptr<Thread>(NULL)).Pass();
+    return LayerTreeHost::Create(
+        &client_, LayerTreeSettings(), scoped_ptr<Thread>()).Pass();
   }
 
   scoped_ptr<LayerTreeHost> Create(LayerTreeSettings settings) {
-    return LayerTreeHost::Create(&client_,
-                                 settings,
-                                 scoped_ptr<Thread>(NULL)).Pass();
+    return LayerTreeHost::Create(&client_, settings, scoped_ptr<Thread>())
+        .Pass();
   }
 
  private:
   FakeLayerTreeHostClient client_;
 };
 
 void AssertLayerTreeHostMatchesForSubtree(Layer* layer, LayerTreeHost* host) {
   EXPECT_EQ(host, layer->layer_tree_host());
 
   for (size_t i = 0; i < layer->children().size(); ++i)
@@ skipping 246 matching lines @@
               << "Flags: " << contents_opaque << ", " << layer_opaque << ", "
               << host_opaque << "\n";
         }
       }
     }
   }
 }
 
 }  // namespace
 }  // namespace cc