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

chrome/browser/profiles/profile_impl.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 "chrome/browser/profiles/profile_impl.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 853 matching lines @@
   } else {
     chromeos::UserSessionManager::GetInstance()->RespectLocalePreferenceWrapper(
         this, base::Bind(&ProfileImpl::OnLocaleReady, base::Unretained(this)));
   }
 #else
   OnLocaleReady();
 #endif
 }
 
 bool ProfileImpl::WasCreatedByVersionOrLater(const std::string& version) {
-  base::Version profile_version(ChromeVersionService::GetVersion(prefs_.get()));
-  base::Version arg_version(version);
+  Version profile_version(ChromeVersionService::GetVersion(prefs_.get()));
+  Version arg_version(version);
   return (profile_version.CompareTo(arg_version) >= 0);
 }
 
 void ProfileImpl::SetExitType(ExitType exit_type) {
 #if defined(OS_CHROMEOS)
   if (chromeos::ProfileHelper::IsSigninProfile(this))
     return;
 #endif
   if (!prefs_)
     return;
@@ skipping 420 matching lines @@
 ProfileImpl::CreateDomainReliabilityMonitor(PrefService* local_state) {
   domain_reliability::DomainReliabilityService* service =
       domain_reliability::DomainReliabilityServiceFactory::GetInstance()->
           GetForBrowserContext(this);
   if (!service)
     return scoped_ptr<domain_reliability::DomainReliabilityMonitor>();
 
   return service->CreateMonitor(
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 }