Add missing (and remove superfluous) 'explicit' from constructors.

remoting/base/plugin_thread_task_runner.h

 // Copyright (c) 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.
 
 #ifndef REMOTING_BASE_PLUGIN_THREAD_TASK_RUNNER_H_
 #define REMOTING_BASE_PLUGIN_THREAD_TASK_RUNNER_H_
 
 #include <set>
 
 #include "base/callback_forward.h"
@@ skipping 14 matching lines @@
  public:
   class Delegate {
    public:
     virtual ~Delegate();
 
     virtual bool RunOnPluginThread(
         base::TimeDelta delay, void(function)(void*), void* data) = 0;
   };
 
   // Caller keeps ownership of delegate.
-  PluginThreadTaskRunner(Delegate* delegate);
+  explicit PluginThreadTaskRunner(Delegate* delegate);
 
   // Detaches the PluginThreadTaskRunner from the underlying Delegate and
   // processes posted tasks until Quit() is called. This is used during plugin
   // shutdown, when the plugin environment has stopped accepting new tasks to
   // run, to process cleanup tasks posted to the plugin thread.
   // This method must be called on the plugin thread.
   void DetachAndRunShutdownLoop();
 
   // Makes DetachAndRunShutdownLoop() stop processing tasks and return control
   // to the caller. Calling Quit() before DetachAndRunShutdownLoop() causes
@@ skipping 75 matching lines @@
 
   // True if the shutdown task loop was been stopped.
   bool stopped_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginThreadTaskRunner);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_BASE_PLUGIN_THREAD_TASK_RUNNER_H_