Use WebIDBKeyPath type in WebKit API, implement IndexedDBKeyPath type.

content/browser/in_process_webkit/browser_webkitplatformsupport_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_IN_PROCESS_WEBKIT_BROWSER_WEBKITPLATFORMSUPPORT_IMPL_H_
 #define CONTENT_BROWSER_IN_PROCESS_WEBKIT_BROWSER_WEBKITPLATFORMSUPPORT_IMPL_H_
 #pragma once
 
 #include "content/common/webkitplatformsupport_impl.h"
 #include "webkit/glue/webfileutilities_impl.h"
@@ skipping 25 matching lines @@
   virtual WebKit::WebThemeEngine* themeEngine();
   virtual WebKit::WebURLLoader* createURLLoader();
   virtual WebKit::WebSocketStreamHandle* createSocketStreamHandle();
   virtual void getPluginList(bool refresh, WebKit::WebPluginListBuilder*);
   virtual WebKit::WebData loadResource(const char* name);
   virtual WebKit::WebSharedWorkerRepository* sharedWorkerRepository();
   virtual int databaseDeleteFile(const WebKit::WebString& vfs_file_name,
                                  bool sync_dir);
   virtual void createIDBKeysFromSerializedValuesAndKeyPath(
       const WebKit::WebVector<WebKit::WebSerializedScriptValue>& values,
-      const WebKit::WebString& keyPath,
+      const WebKit::WebIDBKeyPath& keyPath,
       WebKit::WebVector<WebKit::WebIDBKey>& keys);
   virtual WebKit::WebSerializedScriptValue injectIDBKeyIntoSerializedValue(
       const WebKit::WebIDBKey& key,
       const WebKit::WebSerializedScriptValue& value,
-      const WebKit::WebString& keyPath);
+      const WebKit::WebIDBKeyPath& keyPath);
 
  protected:
   virtual GpuChannelHostFactory* GetGpuChannelHostFactory() OVERRIDE;
 
  private:
   webkit_glue::WebFileUtilitiesImpl file_utilities_;
 };
 
 #endif  // CONTENT_BROWSER_IN_PROCESS_WEBKIT_BROWSER_WEBKITPLATFORMSUPPORT_IMPL_H_