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

chrome/browser/extensions/crx_installer.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_CRX_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_CRX_INSTALLER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 115 matching lines @@
   const std::string& expected_id() const { return expected_id_; }
   void set_expected_id(const std::string& val) { expected_id_ = val; }
 
   // Expected SHA256 hash sum for the package.
   const std::string& expected_hash() const { return expected_hash_; }
   void set_expected_hash(const std::string& val) { expected_hash_ = val; }
 
   bool hash_check_failed() const { return hash_check_failed_; }
   void set_hash_check_failed(bool val) { hash_check_failed_ = val; }
 
-  void set_expected_version(const base::Version& val) {
-    expected_version_.reset(new base::Version(val));
+  void set_expected_version(const Version& val) {
+    expected_version_.reset(new Version(val));
     expected_version_strict_checking_ = true;
   }
 
   bool delete_source() const { return delete_source_; }
   void set_delete_source(bool val) { delete_source_ = val; }
 
   bool allow_silent_install() const { return allow_silent_install_; }
   void set_allow_silent_install(bool val) { allow_silent_install_ = val; }
 
   bool grant_permissions() const { return grant_permissions_; }
@@ skipping 171 matching lines @@
   scoped_ptr<Manifest> expected_manifest_;
 
   // The level of checking when comparing the actual manifest against
   // the |expected_manifest_|.
   WebstoreInstaller::ManifestCheckLevel expected_manifest_check_level_;
 
   // If non-NULL, contains the expected version of the extension we're
   // installing.  Important for external sources, where claiming the wrong
   // version could cause unnecessary unpacking of an extension at every
   // restart.
-  scoped_ptr<base::Version> expected_version_;
+  scoped_ptr<Version> expected_version_;
 
   // If true, the actual version should be same with the |expected_version_|,
   // Otherwise the actual version should be equal to or newer than
   // the |expected_version_|.
   bool expected_version_strict_checking_;
 
   // Whether manual extension installation is enabled. We can't just check this
   // before trying to install because themes are special-cased to always be
   // allowed.
   bool extensions_enabled_;
@@ skipping 91 matching lines @@
 
   // Performs requirements, policy and blacklist checks on the extension.
   ExtensionInstallChecker install_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(CrxInstaller);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CRX_INSTALLER_H_