Use createV8Entry() and toV8Value() with context and isolate defined in WebDOMFileSystem.

chrome/renderer/extensions/media_galleries_custom_bindings.cc

 // 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.
 
 #include "chrome/renderer/extensions/media_galleries_custom_bindings.h"
 
 #include <string>
 
 #include "extensions/renderer/script_context.h"
 #include "third_party/WebKit/public/web/WebDOMFileSystem.h"
@@ skipping 21 matching lines @@
   std::string fs_name =
       fileapi::GetFileSystemName(origin, fileapi::kFileSystemTypeExternal);
   fs_name.append("_");
   fs_name.append(fs_mount);
   const GURL root_url(
       fileapi::GetExternalFileSystemRootURIString(origin, fs_mount));
   args.GetReturnValue().Set(
       blink::WebDOMFileSystem::create(webframe,
                                       blink::WebFileSystemTypeExternal,
                                       blink::WebString::fromUTF8(fs_name),
-                                      root_url).toV8Value());
+                                      root_url)
+          .toV8Value(args.Holder(), args.GetIsolate()));
 }
 
 }  // namespace
 
 MediaGalleriesCustomBindings::MediaGalleriesCustomBindings(
     ScriptContext* context)
     : ObjectBackedNativeHandler(context) {
   RouteFunction("GetMediaFileSystemObject",
                 base::Bind(&GetMediaFileSystemObject));
 }
 
 }  // namespace extensions