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

chrome/browser/extensions/extension_sync_data_unittest.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_sync_data.h"
 
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/version.h"
 #include "extensions/common/extension.h"
@@ skipping 92 matching lines @@
   // the same result, but don't know that it's right).
   ExtensionSyncData extension_sync_data;
   extension_sync_data.PopulateFromExtensionSpecifics(*extension_specifics);
   EXPECT_EQ(kValidId, extension_sync_data.id());
   EXPECT_EQ(GURL(kValidUpdateUrl), extension_sync_data.update_url());
   EXPECT_FALSE(extension_sync_data.enabled());
   EXPECT_EQ(true, extension_sync_data.incognito_enabled());
   EXPECT_FALSE(extension_sync_data.remote_install());
   EXPECT_EQ(ExtensionSyncData::BOOLEAN_TRUE,
             extension_sync_data.all_urls_enabled());
-  EXPECT_TRUE(base::Version(kVersion).Equals(extension_sync_data.version()));
+  EXPECT_TRUE(Version(kVersion).Equals(extension_sync_data.version()));
   EXPECT_EQ(std::string(kName), extension_sync_data.name());
 
   // Check the serialize-deserialize process for ExtensionSyncData to proto.
   SyncDataToProtobufEqual(extension_sync_data);
 
   // The most important thing to test is the "all urls" bit, since it is a
   // tri-state boolean (and thus has more logic). Also flip another bit for a
   // sanity check.
   extension_specifics->set_all_urls_enabled(false);
   extension_specifics->set_incognito_enabled(false);
@@ skipping 97 matching lines @@
       syncer::SyncData::CreateLocalData("sync_tag", "non_unique_title", entity);
 
   // There should be no issue loading the sync data.
   scoped_ptr<ExtensionSyncData> app_sync_data =
       ExtensionSyncData::CreateFromSyncData(sync_data);
   ASSERT_TRUE(app_sync_data.get());
   app_sync_data->GetSyncData();
 }
 
 }  // namespace extensions