Use WebIDBKeyPath type in WebKit API, implement IndexedDBKeyPath type.

content/ppapi_plugin/ppapi_webkitplatformsupport_impl.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_PPAPI_PLUGIN_PPAPI_WEBKITPLATFORMSUPPORT_IMPL_H_
 #define CONTENT_PPAPI_PLUGIN_PPAPI_WEBKITPLATFORMSUPPORT_IMPL_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 32 matching lines @@
       const WebKit::WebString& path, unsigned quota);
   virtual void dispatchStorageEvent(const WebKit::WebString& key,
       const WebKit::WebString& oldValue, const WebKit::WebString& newValue,
       const WebKit::WebString& origin, const WebKit::WebURL& url,
       bool isLocalStorage);
   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);
 
  private:
   class SandboxSupport;
   scoped_ptr<SandboxSupport> sandbox_support_;
 
   DISALLOW_COPY_AND_ASSIGN(PpapiWebKitPlatformSupportImpl);
 };
 
 #endif  // CONTENT_PPAPI_PLUGIN_PPAPI_WEBKITPLATFORMSUPPORT_IMPL_H_