Use WebIDBKeyPath type in WebKit API, implement IndexedDBKeyPath type.

content/common/indexed_db/proxy_webidbdatabase_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_COMMON_INDEXED_DB_PROXY_WEBIDBDATABASE_IMPL_H_
 #define CONTENT_COMMON_INDEXED_DB_PROXY_WEBIDBDATABASE_IMPL_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBDatabase.h"
 
 namespace WebKit {
 class WebIDBCallbacks;
 class WebIDBDatabaseCallbacks;
 class WebString;
 class WebIDBTransaction;
 }
 
 class RendererWebIDBDatabaseImpl : public WebKit::WebIDBDatabase {
  public:
   explicit RendererWebIDBDatabaseImpl(int32 idb_database_id);
   virtual ~RendererWebIDBDatabaseImpl();
 
   // WebKit::WebIDBDatabase
   virtual WebKit::WebString name() const;
   virtual WebKit::WebString version() const;
   virtual WebKit::WebDOMStringList objectStoreNames() const;
   virtual WebKit::WebIDBObjectStore* createObjectStore(
       const WebKit::WebString& name,
-      const WebKit::WebString& key_path,
+      const WebKit::WebIDBKeyPath& key_path,
       bool auto_increment,
       const WebKit::WebIDBTransaction& transaction,
       WebKit::WebExceptionCode& ec);
   virtual void deleteObjectStore(
       const WebKit::WebString& name,
       const WebKit::WebIDBTransaction& transaction,
       WebKit::WebExceptionCode& ec);
   virtual void setVersion(
       const WebKit::WebString& version, WebKit::WebIDBCallbacks* callbacks,
       WebKit::WebExceptionCode& ec);
   virtual WebKit::WebIDBTransaction* transaction(
       const WebKit::WebDOMStringList& names,
       unsigned short mode,
       WebKit::WebExceptionCode& ec);
   virtual void close();
   virtual void open(WebKit::WebIDBDatabaseCallbacks*);
 
  private:
   int32 idb_database_id_;
 };
 
 #endif  // CONTENT_COMMON_INDEXED_DB_PROXY_WEBIDBDATABASE_IMPL_H_