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

remoting/host/ipc_event_executor.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_HOST_IPC_EVENT_EXECUTOR_H_
 #define REMOTING_HOST_IPC_EVENT_EXECUTOR_H_
 
 #include "base/memory/ref_counted.h"
 #include "remoting/host/event_executor.h"
 #include "remoting/proto/event.pb.h"
 
 namespace remoting {
 
 class DesktopSessionProxy;
 
 // Routes EventExecutor calls though the IPC channel to the desktop session
 // agent running in the desktop integration process.
 class IpcEventExecutor : public EventExecutor {
  public:
-  IpcEventExecutor(scoped_refptr<DesktopSessionProxy> desktop_session_proxy);
+  explicit IpcEventExecutor(
+      scoped_refptr<DesktopSessionProxy> desktop_session_proxy);
   virtual ~IpcEventExecutor();
 
   // ClipboardStub interface.
   virtual void InjectClipboardEvent(
       const protocol::ClipboardEvent& event) OVERRIDE;
 
   // InputStub interface.
   virtual void InjectKeyEvent(const protocol::KeyEvent& event) OVERRIDE;
   virtual void InjectMouseEvent(const protocol::MouseEvent& event) OVERRIDE;
 
   // EventExecutor interface.
   virtual void Start(
       scoped_ptr<protocol::ClipboardStub> client_clipboard) OVERRIDE;
 
  private:
   // Wraps the IPC channel to the desktop process.
   scoped_refptr<DesktopSessionProxy> desktop_session_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(IpcEventExecutor);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_IPC_EVENT_EXECUTOR_H_