Pass the v8::Context through the willDestroyServiceWorkerContextOnWorkerThread event.

extensions/renderer/dispatcher.h

 // Copyright 2014 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 EXTENSIONS_RENDERER_DISPATCHER_H_
 #define EXTENSIONS_RENDERER_DISPATCHER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 84 matching lines @@
   // Runs on a different thread and should not use any member variables.
   static void DidInitializeServiceWorkerContextOnWorkerThread(
       v8::Local<v8::Context> v8_context,
       const GURL& url);
 
   void WillReleaseScriptContext(blink::WebLocalFrame* frame,
                                 const v8::Local<v8::Context>& context,
                                 int world_id);
 
   // Runs on a different thread and should not use any member variables.
-  static void WillDestroyServiceWorkerContextOnWorkerThread(const GURL& url);
+  static void WillDestroyServiceWorkerContextOnWorkerThread(
+      v8::Local<v8::Context> v8_context,
+      const GURL& url);
 
   void DidCreateDocumentElement(blink::WebLocalFrame* frame);
 
   void OnExtensionResponse(int request_id,
                            bool success,
                            const base::ListValue& response,
                            const std::string& error);
 
   // Dispatches the event named |event_name| to all render views.
   void DispatchEvent(const std::string& extension_id,
@@ skipping 188 matching lines @@
 
   // Status of webrequest usage.
   bool webrequest_used_;
 
   DISALLOW_COPY_AND_ASSIGN(Dispatcher);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_DISPATCHER_H_