chrome: Use stl utilities from the base namespace

chrome/browser/extensions/updater/extension_cache_impl.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_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
@@ skipping 71 matching lines @@
                                       const base::FilePath& file_path,
                                       const std::string& version,
                                       const PutExtensionCallback& callback) {
   if (cache_ && CachingAllowed(id))
     cache_->PutExtension(id, expected_hash, file_path, version, callback);
   else
     callback.Run(file_path, true);
 }
 
 bool ExtensionCacheImpl::CachingAllowed(const std::string& id) {
-  return ContainsKey(allowed_extensions_, id);
+  return base::ContainsKey(allowed_extensions_, id);
 }
 
 void ExtensionCacheImpl::OnCacheInitialized() {
   for (std::vector<base::Closure>::iterator it = init_callbacks_.begin();
        it != init_callbacks_.end(); ++it) {
     it->Run();
   }
   init_callbacks_.clear();
 
   uint64_t cache_size = 0;
@@ skipping 32 matching lines @@
       // We deliberately keep the file with incorrect hash sum, so that it
       // will not be re-downloaded each time.
       break;
     default:
       cache_->RemoveExtension(id, hash);
       break;
   }
 }
 
 }  // namespace extensions