Update all users of base::Version to explicitly specify the namespace, and clean up the header.

chrome/browser/extensions/extension_sync_data.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_BROWSER_EXTENSIONS_EXTENSION_SYNC_DATA_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SYNC_DATA_H_
 
 #include <string>
 
 #include "base/version.h"
@@ skipping 41 matching lines @@
 
   // Version-independent properties (i.e., used even when the
   // version of the currently-installed extension doesn't match
   // |version|).
   bool uninstalled() const { return uninstalled_; }
   bool enabled() const { return enabled_; }
   bool incognito_enabled() const { return incognito_enabled_; }
 
   // Version-dependent properties (i.e., should be used only when the
   // version of the currenty-installed extension matches |version|).
-  const Version& version() const { return version_; }
+  const base::Version& version() const { return version_; }
   const GURL& update_url() const { return update_url_; }
   // Used only for debugging.
   const std::string& name() const { return name_; }
 
  private:
   // Populate this class from sync inputs.
   void PopulateFromSyncData(const syncer::SyncData& sync_data);
 
   std::string id_;
   bool uninstalled_;
   bool enabled_;
   bool incognito_enabled_;
-  Version version_;
+  base::Version version_;
   GURL update_url_;
   std::string name_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SYNC_DATA_H_