Use WebIDBKeyPath type in WebKit API, implement IndexedDBKeyPath type.

content/renderer/renderer_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_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_
 #define CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 52 matching lines @@
       const WebKit::WebString& vfs_file_name) OVERRIDE;
   virtual long long databaseGetSpaceAvailableForOrigin(
       const WebKit::WebString& origin_identifier) OVERRIDE;
   virtual WebKit::WebString signedPublicKeyAndChallengeString(
       unsigned key_size_index,
       const WebKit::WebString& challenge,
       const WebKit::WebURL& url) OVERRIDE;
   virtual WebKit::WebIDBFactory* idbFactory() OVERRIDE;
   virtual void createIDBKeysFromSerializedValuesAndKeyPath(
       const WebKit::WebVector<WebKit::WebSerializedScriptValue>& values,
-      const WebKit::WebString& keyPath,
+      const WebKit::WebIDBKeyPath& keyPath,
       WebKit::WebVector<WebKit::WebIDBKey>& keys) OVERRIDE;
   virtual WebKit::WebSerializedScriptValue injectIDBKeyIntoSerializedValue(
       const WebKit::WebIDBKey& key,
       const WebKit::WebSerializedScriptValue& value,
-      const WebKit::WebString& keyPath) OVERRIDE;
+      const WebKit::WebIDBKeyPath& keyPath) OVERRIDE;
   virtual WebKit::WebFileSystem* fileSystem() OVERRIDE;
   virtual WebKit::WebSharedWorkerRepository* sharedWorkerRepository() OVERRIDE;
   virtual bool canAccelerate2dCanvas();
   virtual double audioHardwareSampleRate() OVERRIDE;
   virtual size_t audioHardwareBufferSize() OVERRIDE;
   virtual WebKit::WebAudioDevice* createAudioDevice(
       size_t buffer_size, unsigned channels, double sample_rate,
       WebKit::WebAudioDevice::RenderCallback* callback) OVERRIDE;
   virtual WebKit::WebBlobRegistry* blobRegistry() OVERRIDE;
   virtual void sampleGamepads(WebKit::WebGamepads&) OVERRIDE;
@@ skipping 41 matching lines @@
   scoped_ptr<WebKit::WebIDBFactory> web_idb_factory_;
 
   scoped_ptr<WebFileSystemImpl> web_file_system_;
 
   scoped_ptr<WebKit::WebBlobRegistry> blob_registry_;
 
   scoped_ptr<content::GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
 };
 
 #endif  // CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_