IndexedDB: Remove uses of WebKit API types from back-end code

content/browser/indexed_db/webidbfactory_impl.h

 // Copyright (c) 2013 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_INDEXED_DB_WEBIDBFACTORY_IMPL_H_
 #define CONTENT_BROWSER_INDEXED_DB_WEBIDBFACTORY_IMPL_H_
 
 #include "base/memory/ref_counted.h"
-
-namespace WebKit {
-class WebString;
-}
+#include "base/strings/string16.h"
 
 namespace content {
 
 class IndexedDBFactory;
 class IndexedDBCallbacksBase;
 class IndexedDBDatabaseCallbacks;
 
 class WebIDBFactoryImpl {
  public:
   WebIDBFactoryImpl();
   virtual ~WebIDBFactoryImpl();
 
   virtual void getDatabaseNames(IndexedDBCallbacksBase* callbacks,
-                                const WebKit::WebString& database_identifier,
-                                const WebKit::WebString& data_dir);
-  virtual void open(const WebKit::WebString& name,
+                                const string16& database_identifier,
+                                const string16& data_dir);
+  virtual void open(const string16& name,
                     long long version,
                     long long transaction_id,
                     IndexedDBCallbacksBase* callbacks,
                     IndexedDBDatabaseCallbacks* database_callbacks,
-                    const WebKit::WebString& database_identifier,
-                    const WebKit::WebString& data_dir);
-  virtual void deleteDatabase(const WebKit::WebString& name,
+                    const string16& database_identifier,
+                    const string16& data_dir);
+  virtual void deleteDatabase(const string16& name,
                               IndexedDBCallbacksBase* callbacks,
-                              const WebKit::WebString& database_identifier,
-                              const WebKit::WebString& data_dir);
+                              const string16& database_identifier,
+                              const string16& data_dir);
 
  private:
   scoped_refptr<IndexedDBFactory> idb_factory_backend_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_WEBIDBFACTORY_IMPL_H_