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

chrome/installer/util/google_chrome_distribution_dummy.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.
 //
 // This file defines dummy implementation of several functions from the
 // BrowserDistribution class for Google Chrome. These functions allow 64-bit
 // Windows Chrome binary to build successfully. Since this binary is only used
 // for Native Client support, most of the install/uninstall functionality is not
 // necessary there.
 
@@ skipping 13 matching lines @@
           scoped_ptr<AppRegistrationData>(
               new NonUpdatingAppRegistrationData(base::string16()))) {
 }
 
 GoogleChromeDistribution::GoogleChromeDistribution(
     scoped_ptr<AppRegistrationData> app_reg_data)
     : BrowserDistribution(CHROME_BROWSER, app_reg_data.Pass()) {
 }
 
 void GoogleChromeDistribution::DoPostUninstallOperations(
-    const base::Version& version,
+    const Version& version,
     const base::FilePath& local_data_path,
     const base::string16& distribution_data) {
 }
 
 base::string16 GoogleChromeDistribution::GetActiveSetupGuid() {
   return base::string16();
 }
 
 base::string16 GoogleChromeDistribution::GetBaseAppName() {
   return base::string16();
@@ skipping 62 matching lines @@
     installer::InstallStatus install_status) {
 }
 
 bool GoogleChromeDistribution::ShouldSetExperimentLabels() {
   return false;
 }
 
 bool GoogleChromeDistribution::HasUserExperiments() {
   return false;
 }