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

chrome/browser/browsing_data/mock_browsing_data_server_bound_cert_helper.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_BROWSER_BROWSING_DATA_MOCK_BROWSING_DATA_SERVER_BOUND_CERT_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_MOCK_BROWSING_DATA_SERVER_BOUND_CERT_HELPER_H_
 
 #include <map>
 #include <string>
 
 #include "chrome/browser/browsing_data/browsing_data_server_bound_cert_helper.h"
 
 // Mock for BrowsingDataServerBoundCertHelper.
 class MockBrowsingDataServerBoundCertHelper
     : public BrowsingDataServerBoundCertHelper {
  public:
-  explicit MockBrowsingDataServerBoundCertHelper();
+  MockBrowsingDataServerBoundCertHelper();
 
   // BrowsingDataServerBoundCertHelper methods.
   virtual void StartFetching(const FetchResultCallback& callback) OVERRIDE;
   virtual void DeleteServerBoundCert(const std::string& server_id) OVERRIDE;
 
   // Adds a server_bound_cert sample.
   void AddServerBoundCertSample(const std::string& server_id);
 
   // Notifies the callback.
   void Notify();
@@ skipping 10 matching lines @@
 
   FetchResultCallback callback_;
 
   net::ServerBoundCertStore::ServerBoundCertList server_bound_cert_list_;
 
   // Stores which server_bound_certs exist.
   std::map<const std::string, bool> server_bound_certs_;
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_MOCK_BROWSING_DATA_SERVER_BOUND_CERT_HELPER_H_