Consistently use namespaced base::Version in chrome/installer.

chrome/installer/util/fake_product_state.h

 // Copyright (c) 2011 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_INSTALLER_UTIL_FAKE_PRODUCT_STATE_H_
 #define CHROME_INSTALLER_UTIL_FAKE_PRODUCT_STATE_H_
 
 #include <string>
 #include "chrome/installer/util/installation_state.h"
 
 namespace installer {
 
 // A ProductState helper for use by unit tests.
 class FakeProductState : public ProductState {
  public:
   // Takes ownership of |version|.
-  void set_version(Version* version) { version_.reset(version); }
+  void set_version(base::Version* version) { version_.reset(version); }
   void set_multi_install(bool multi) { multi_install_ = multi; }
   void set_brand(const std::wstring& brand) { brand_ = brand; }
   void set_usagestats(DWORD usagestats) {
     has_usagestats_ = true;
     usagestats_ = usagestats;
   }
   void clear_usagestats() { has_usagestats_ = false; }
   void SetUninstallProgram(const base::FilePath& setup_exe) {
     uninstall_command_ = base::CommandLine(setup_exe);
   }
   void AddUninstallSwitch(const std::string& option) {
     uninstall_command_.AppendSwitch(option);
   }
 };
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_FAKE_PRODUCT_STATE_H_