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

cc/trees/layer_tree_host_impl_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/trees/layer_tree_host_impl.h"
 
 #include <cmath>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 43 matching lines @@
 using ::testing::_;
 using media::VideoFrame;
 
 namespace cc {
 namespace {
 
 class LayerTreeHostImplTest : public testing::Test,
                               public LayerTreeHostImplClient {
  public:
   LayerTreeHostImplTest()
-      : proxy_(scoped_ptr<Thread>(NULL)),
+      : proxy_(scoped_ptr<Thread>()),
         always_impl_thread_(&proxy_),
         always_main_thread_blocked_(&proxy_),
         did_try_initialize_renderer_(false),
         on_can_draw_state_changed_called_(false),
         has_pending_tree_(false),
         did_request_commit_(false),
         did_request_redraw_(false),
         did_upload_visible_tile_(false),
         reduce_memory_result_(true) {
     media::InitializeMediaLibraryForTesting();
@@ skipping 5792 matching lines @@
   EXPECT_FALSE(did_try_initialize_renderer_);
   host_impl_->DeferredInitialize(scoped_refptr<ContextProvider>());
   EXPECT_TRUE(did_try_initialize_renderer_);
 
   // Defer intialized GL draw.
   DrawFrame();
 }
 
 }  // namespace
 }  // namespace cc