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

chrome/installer/util/installation_state.h

 // 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.
 
 #ifndef CHROME_INSTALLER_UTIL_INSTALLATION_STATE_H_
 #define CHROME_INSTALLER_UTIL_INSTALLATION_STATE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 87 matching lines @@
   ProductState& CopyFrom(const ProductState& other);
 
   // Clears the state of this object.
   void Clear();
 
  protected:
   static bool InitializeCommands(const base::win::RegKey& version_key,
                                  AppCommands* commands);
 
   ChannelInfo channel_;
-  std::unique_ptr<Version> version_;
-  std::unique_ptr<Version> old_version_;
+  std::unique_ptr<base::Version> version_;
+  std::unique_ptr<base::Version> old_version_;
   std::wstring brand_;
   std::wstring rename_cmd_;
   std::wstring oem_install_;
   base::CommandLine uninstall_command_;
   AppCommands commands_;
   DWORD eula_accepted_;
   DWORD usagestats_;
   bool msi_ : 1;
   bool multi_install_ : 1;
   bool has_eula_accepted_ : 1;
@@ skipping 43 matching lines @@
   ProductState user_products_[NUM_PRODUCTS];
   ProductState system_products_[NUM_PRODUCTS];
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstallationState);
 };  // class InstallationState
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_INSTALLATION_STATE_H_