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

chrome/installer/util/browser_distribution.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 a class that contains various method related to branding.
 // It provides only default implementations of these methods. Usually to add
 // specific branding, we will need to extend this class with a custom
 // implementation.
 
 #include "chrome/installer/util/browser_distribution.h"
@@ skipping 124 matching lines @@
 
 base::string16 BrowserDistribution::GetStateMediumKey() const {
   return app_reg_data_->GetStateMediumKey();
 }
 
 base::string16 BrowserDistribution::GetVersionKey() const {
   return app_reg_data_->GetVersionKey();
 }
 
 void BrowserDistribution::DoPostUninstallOperations(
-    const base::Version& version,
-    const base::FilePath& local_data_path,
-    const base::string16& distribution_data) {}
+    const Version& version, const base::FilePath& local_data_path,
+    const base::string16& distribution_data) {
+}
 
 base::string16 BrowserDistribution::GetActiveSetupGuid() {
   return kChromiumActiveSetupGuid;
 }
 
 base::string16 BrowserDistribution::GetBaseAppName() {
   return L"Chromium";
 }
 
 base::string16 BrowserDistribution::GetDisplayName() {
@@ skipping 115 matching lines @@
     installer::InstallStatus install_status) {
 }
 
 bool BrowserDistribution::ShouldSetExperimentLabels() {
   return false;
 }
 
 bool BrowserDistribution::HasUserExperiments() {
   return false;
 }