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

chrome/browser/component_updater/sw_reporter_installer_win.cc

 // Copyright (c) 2014 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.
 
 #include "chrome/browser/component_updater/sw_reporter_installer_win.h"
 
 #include <stdint.h>
 
 #include <map>
 #include <string>
@@ skipping 198 matching lines @@
   static base::FilePath install_dir() {
     // The base directory on windows looks like:
     // <profile>\AppData\Local\Google\Chrome\User Data\SwReporter\.
     base::FilePath result;
     PathService::Get(DIR_SW_REPORTER, &result);
     return result;
   }
 
   static std::string ID() {
     update_client::CrxComponent component;
-    component.version = base::Version("0.0.0.0");
+    component.version = Version("0.0.0.0");
     GetPkHash(&component.pk_hash);
     return update_client::GetCrxComponentID(component);
   }
 
  private:
   static void GetPkHash(std::vector<uint8_t>* hash) {
     DCHECK(hash);
     hash->assign(kSha256Hash, kSha256Hash + sizeof(kSha256Hash));
   }
 };
@@ skipping 92 matching lines @@
 }
 
 void RegisterProfilePrefsForSwReporter(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterStringPref(prefs::kSwReporterPromptVersion, "");
 
   registry->RegisterStringPref(prefs::kSwReporterPromptSeed, "");
 }
 
 }  // namespace component_updater