service worker: use 200 OK for update requests even in the no update case

third_party/WebKit/public/web/WebEmbeddedWorker.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 40 matching lines @@
     BLINK_EXPORT static WebEmbeddedWorker* create(
         WebServiceWorkerContextClient*,
         WebWorkerContentSettingsClientProxy*);
 
     virtual ~WebEmbeddedWorker() { }
 
     // Starts and terminates WorkerThread and WorkerGlobalScope.
     virtual void startWorkerContext(const WebEmbeddedWorkerStartData&) = 0;
     virtual void terminateWorkerContext() = 0;
 
+    // Resumes starting a worker startup that was paused via
+    // WebEmbeddedWorkerStartData.pauseAfterDownloadMode.
+    virtual void resumeAfterDownload() = 0;
+
     // Inspector related methods.
     virtual void attachDevTools(const WebString& hostId, int sessionId) = 0;
     virtual void reattachDevTools(const WebString& hostId, int sessionId, const WebString& savedState) = 0;
     virtual void detachDevTools() = 0;
     virtual void dispatchDevToolsMessage(int sessionId, const WebString&) = 0;
 };
 
 } // namespace blink
 
 #endif // WebEmbeddedWorker_h