Remove explicit keyword from multi-argument constructors

chrome/service/cloud_print/cloud_print_proxy_backend.cc

 // Copyright (c) 2011 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 "chrome/service/cloud_print/cloud_print_proxy_backend.h"
 
 #include <map>
 #include <vector>
 
 #include "base/file_util.h"
@@ skipping 26 matching lines @@
 class CloudPrintProxyBackend::Core
     : public base::RefCountedThreadSafe<CloudPrintProxyBackend::Core>,
       public CloudPrintURLFetcherDelegate,
       public cloud_print::PrintServerWatcherDelegate,
       public PrinterJobHandlerDelegate,
       public notifier::TalkMediator::Delegate,
       public gaia::GaiaOAuthClient::Delegate {
  public:
   // It is OK for print_server_url to be empty. In this case system should
   // use system default (local) print server.
-  explicit Core(CloudPrintProxyBackend* backend,
-                const GURL& cloud_print_server_url,
-                const DictionaryValue* print_system_settings,
-                const gaia::OAuthClientInfo& oauth_client_info,
-                bool enable_job_poll);
+  Core(CloudPrintProxyBackend* backend,
+       const GURL& cloud_print_server_url,
+       const DictionaryValue* print_system_settings,
+       const gaia::OAuthClientInfo& oauth_client_info,
+       bool enable_job_poll);
 
   // Note:
   //
   // The Do* methods are the various entry points from CloudPrintProxyBackend
   // It calls us on a dedicated thread to actually perform synchronous
   // (and potentially blocking) operations.
   //
   // Called on the CloudPrintProxyBackend core_thread_ to perform
   // initialization. When we are passed in an LSID we authenticate using that
   // and retrieve new auth tokens.
@@ skipping 1097 matching lines @@
   OnAuthError();
 }
 
 void CloudPrintProxyBackend::Core::OnNetworkError(int response_code) {
   // Since we specify inifinite retries on network errors, this should never
   // be called.
   NOTREACHED() <<
       "OnNetworkError invoked when not expected, response code is " <<
       response_code;
 }