Revert of base: Remove using:: declaration from version.h header.

chrome/browser/component_updater/ev_whitelist_component_installer.cc

 // Copyright 2014 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/browser/component_updater/ev_whitelist_component_installer.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 61 matching lines @@
     VLOG(1) << "Failed reading from " << stored_whitelist_path.value();
     return;
   }
 
   // The version number is unknown as the list is loaded from disk, not
   // the component.
   // In practice very quickly the component updater will call ComponentReady
   // which will have a valid version.
   scoped_refptr<net::ct::EVCertsWhitelist> new_whitelist(
       new packed_ct_ev_whitelist::PackedEVCertsWhitelist(compressed_list,
-                                                         base::Version()));
+                                                         Version()));
   if (!new_whitelist->IsValid()) {
     VLOG(1) << "Failed uncompressing EV certs whitelist.";
     return;
   }
 
   VLOG(1) << "EV whitelist: Sucessfully loaded initial data.";
   packed_ct_ev_whitelist::SetEVCertsWhitelist(new_whitelist);
 }
 
 }  // namespace
@@ skipping 96 matching lines @@
   installer->Register(cus, base::Closure());
 
   if (!content::BrowserThread::PostBlockingPoolTask(
           FROM_HERE,
           base::Bind(&DoInitialLoadFromDisk, GetEVWhitelistFilePath(path)))) {
     NOTREACHED();
   }
 }
 
 }  // namespace component_updater