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

content/renderer/pepper/pepper_in_process_router.cc

 // 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.
 
 #include "content/renderer/pepper/pepper_in_process_router.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "content/renderer/pepper/renderer_ppapi_host_impl.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_sender.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/resource_tracker.h"
 
 namespace content {
 
 class PepperInProcessRouter::Channel : public IPC::Sender {
  public:
-  Channel(const base::Callback<bool(IPC::Message*)>& callback)
+  explicit Channel(const base::Callback<bool(IPC::Message*)>& callback)
       : callback_(callback) {}
 
   virtual ~Channel() {}
 
   virtual bool Send(IPC::Message* message) OVERRIDE {
     return callback_.Run(message);
   }
 
  private:
   base::Callback<bool(IPC::Message*)> callback_;
@@ skipping 96 matching lines @@
           reply_params.pp_resource());
   if (!resource) {
     // The resource could have been destroyed while the async processing was
     // pending. Just drop the message.
     return;
   }
   resource->OnReplyReceived(reply_params, nested_msg);
 }
 
 }  // namespace content