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

chrome/renderer/extensions/request_sender.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 CHROME_RENDERER_EXTENSIONS_REQUEST_SENDER_H_
 #define CHROME_RENDERER_EXTENSIONS_REQUEST_SENDER_H_
 
 #include <string>
 #include <map>
 
 #include "base/memory/linked_ptr.h"
 #include "v8/include/v8.h"
 
 namespace base {
 class ListValue;
 }
 
 namespace extensions {
 class ChromeV8ContextSet;
 class Dispatcher;
 
 struct PendingRequest;
 
 // Responsible for sending requests for named extension API functions to the
 // extension host and routing the responses back to the caller.
 class RequestSender {
  public:
-  explicit RequestSender(Dispatcher* dispatcher,
-                         ChromeV8ContextSet* context_set);
+  RequestSender(Dispatcher* dispatcher,
+                ChromeV8ContextSet* context_set);
   ~RequestSender();
 
   // Makes a call to the API function |name| that is to be handled by the
   // extension host. The response to this request will be received in
   // HandleResponse().
   // TODO(koz): Remove |request_id| and generate that internally.
   void StartRequest(const std::string& name,
                     int request_id,
                     bool has_callback,
                     bool for_io_thread,
@@ skipping 15 matching lines @@
   Dispatcher* dispatcher_;
   PendingRequestMap pending_requests_;
   ChromeV8ContextSet* context_set_;
 
   DISALLOW_COPY_AND_ASSIGN(RequestSender);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_REQUEST_SENDER_H_