chrome: Use stl utilities from the base namespace

chrome/browser/extensions/updater/extension_cache_fake.cc

 // Copyright 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/extensions/updater/extension_cache_fake.h"
 
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "content/public/browser/browser_thread.h"
 
@@ skipping 37 matching lines @@
       *file_path = it->second.second;
     return true;
   }
 }
 
 void ExtensionCacheFake::PutExtension(const std::string& id,
                                       const std::string& expected_hash,
                                       const base::FilePath& file_path,
                                       const std::string& version,
                                       const PutExtensionCallback& callback) {
-  if (ContainsKey(allowed_extensions_, id)) {
+  if (base::ContainsKey(allowed_extensions_, id)) {
     cache_[id].first = version;
     cache_[id].second = file_path;
     content::BrowserThread::PostTask(
         content::BrowserThread::UI,
         FROM_HERE,
         base::Bind(callback, file_path, false));
   } else {
     callback.Run(file_path, true);
   }
 }
 
 }  // namespace extensions