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

chrome/renderer/extensions/sync_file_system_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/sync_file_system_custom_bindings.h"
 
 #include <string>
 
 #include "extensions/renderer/script_context.h"
 #include "third_party/WebKit/public/web/WebDOMFileSystem.h"
@@ skipping 34 matching lines @@
   }
   std::string root_url(*v8::String::Utf8Value(args[1]));
   if (root_url.empty()) {
     NOTREACHED();
     return;
   }
 
   blink::WebLocalFrame* webframe =
       blink::WebLocalFrame::frameForContext(context()->v8_context());
   args.GetReturnValue().Set(
-      blink::WebDOMFileSystem::create(
-          webframe,
-          blink::WebFileSystemTypeExternal,
-          blink::WebString::fromUTF8(name),
-          GURL(root_url)).toV8Value());
+      blink::WebDOMFileSystem::create(webframe,
+                                      blink::WebFileSystemTypeExternal,
+                                      blink::WebString::fromUTF8(name),
+                                      GURL(root_url))
+          .toV8Value(args.Holder(), args.GetIsolate()));
 }
 
 }  // namespace extensions