Use WebIDBKeyPath type in WebKit API, implement IndexedDBKeyPath type.

content/browser/in_process_webkit/indexed_db_key_utility_client.h

 // Copyright (c) 2011 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_IN_PROCESS_WEBKIT_INDEXED_DB_KEY_UTILITY_CLIENT_H_
 #define CONTENT_BROWSER_IN_PROCESS_WEBKIT_INDEXED_DB_KEY_UTILITY_CLIENT_H_
 #pragma once
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
-#include "base/string16.h"
 #include "content/common/content_export.h"
 
 class IndexedDBKey;
 class KeyUtilityClientImpl;
 
 namespace base {
 template <typename T>
 struct DefaultLazyInstanceTraits;
 }  // namespace base
 
 namespace content {
+class IndexedDBKeyPath;
 class SerializedScriptValue;
 }
 
 // Class for obtaining IndexedDBKeys from the SerializedScriptValues given
 // an IDBKeyPath. This class is a thin singleton wrapper around the
 // KeyUtilityClientImpl, which does the real work.
 class IndexedDBKeyUtilityClient {
  public:
   // Synchronously obtain the |keys| from |values| for the given |key_path|.
   static void CreateIDBKeysFromSerializedValuesAndKeyPath(
       const std::vector<content::SerializedScriptValue>& values,
-      const string16& key_path,
+      const content::IndexedDBKeyPath& key_path,
       std::vector<IndexedDBKey>* keys);
 
   // Synchronously inject |key| into |value| using |key_path|. Returns the new
   // value.
   static content::SerializedScriptValue InjectIDBKeyIntoSerializedValue(
       const IndexedDBKey& key,
       const content::SerializedScriptValue& value,
-      const string16& key_path);
+      const content::IndexedDBKeyPath& key_path);
 
   // Shut down the underlying implementation. Must be called on the IO thread.
   static void Shutdown();
 
  private:
   friend struct base::DefaultLazyInstanceTraits<IndexedDBKeyUtilityClient>;
   IndexedDBKeyUtilityClient();
   ~IndexedDBKeyUtilityClient();
 
   bool is_shutdown_;
 
   // The real client; laziliy instantiated.
   scoped_refptr<KeyUtilityClientImpl> impl_;
 };
 
 #endif  // CONTENT_BROWSER_IN_PROCESS_WEBKIT_INDEXED_DB_KEY_UTILITY_CLIENT_H_