Remove implicit conversions from scoped_refptr to T* in cc/trees/

cc/trees/blocking_task_runner.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/trees/blocking_task_runner.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/memory/singleton.h"
@@ skipping 24 matching lines @@
 
   for (size_t i = 0; i < task_runners->runners.size(); ++i) {
     if (task_runners->runners[i]->thread_id_ == thread_id) {
       current_task_runner = task_runners->runners[i];
     } else if (task_runners->runners[i]->HasOneRef()) {
       task_runners->runners.erase(task_runners->runners.begin() + i);
       i--;
     }
   }
 
-  if (current_task_runner)
+  if (current_task_runner.get())
     return current_task_runner;
 
   scoped_refptr<BlockingTaskRunner> runner =
       new BlockingTaskRunner(base::MessageLoopProxy::current());
   task_runners->runners.push_back(runner);
   return runner;
 }
 
 BlockingTaskRunner::BlockingTaskRunner(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner)
@@ skipping 41 matching lines @@
 BlockingTaskRunner::CapturePostTasks::CapturePostTasks()
     : blocking_runner_(BlockingTaskRunner::current()) {
   blocking_runner_->SetCapture(true);
 }
 
 BlockingTaskRunner::CapturePostTasks::~CapturePostTasks() {
   blocking_runner_->SetCapture(false);
 }
 
 }  // namespace cc