cc: Change scoped_ptr<T>() to nullptr.

cc/debug/unittest_only_benchmark.cc

 // Copyright 2013 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/debug/unittest_only_benchmark.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/values.h"
 #include "cc/debug/unittest_only_benchmark_impl.h"
@@ skipping 15 matching lines @@
 
   if (settings->HasKey("run_benchmark_impl"))
     settings->GetBoolean("run_benchmark_impl", &create_impl_benchmark_);
 }
 
 UnittestOnlyBenchmark::~UnittestOnlyBenchmark() {
   weak_ptr_factory_.InvalidateWeakPtrs();
 }
 
 void UnittestOnlyBenchmark::DidUpdateLayers(LayerTreeHost* host) {
-  NotifyDone(scoped_ptr<base::Value>());
+  NotifyDone(nullptr);
 }
 
 bool UnittestOnlyBenchmark::ProcessMessage(scoped_ptr<base::Value> value) {
   base::DictionaryValue* message = nullptr;
   value->GetAsDictionary(&message);
   bool can_handle;
   if (message->HasKey("can_handle")) {
     message->GetBoolean("can_handle", &can_handle);
     if (can_handle)
       return true;
@@ skipping 11 matching lines @@
     return make_scoped_ptr<MicroBenchmarkImpl>(nullptr);
 
   return make_scoped_ptr(new UnittestOnlyBenchmarkImpl(
       origin_loop,
       nullptr,
       base::Bind(&UnittestOnlyBenchmark::RecordImplResults,
                  weak_ptr_factory_.GetWeakPtr())));
 }
 
 }  // namespace cc