Use string16 for cache_name in the back end of CacheStorage.

content/browser/cache_storage/cache_storage_dispatcher_host.h

 // Copyright 2015 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 CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_DISPATCHER_HOST_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 79 matching lines @@
                                  bool has_cache,
                                  CacheStorageError error);
   void OnCacheStorageOpenCallback(int thread_id,
                                   int request_id,
                                   const scoped_refptr<CacheStorageCache>& cache,
                                   CacheStorageError error);
   void OnCacheStorageDeleteCallback(int thread_id,
                                     int request_id,
                                     bool deleted,
                                     CacheStorageError error);
-  void OnCacheStorageKeysCallback(int thread_id,
-                                  int request_id,
-                                  const std::vector<std::string>& strings,
-                                  CacheStorageError error);
+  void OnCacheStorageKeysCallback(
+      int thread_id,
+      int request_id,
+      const std::vector<base::string16>& cache_names,
+      CacheStorageError error);
   void OnCacheStorageMatchCallback(
       int thread_id,
       int request_id,
       CacheStorageError error,
       scoped_ptr<ServiceWorkerResponse> response,
       scoped_ptr<storage::BlobDataHandle> blob_data_handle);
 
   // Cache callbacks.
   void OnCacheMatchCallback(
       int thread_id,
@@ skipping 48 matching lines @@
   UUIDToBlobDataHandleList blob_handle_store_;
 
   scoped_refptr<CacheStorageContextImpl> context_;
 
   DISALLOW_COPY_AND_ASSIGN(CacheStorageDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_DISPATCHER_HOST_H_