Add DCHECK to WebSharedWorkerImpl to assert WebFrameClient params.

third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp

 /*
  * Copyright (C) 2009 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 151 matching lines @@
   // to have same origin as the worker so the loading checks work correctly.
   CString content("");
   RefPtr<SharedBuffer> buffer(
       SharedBuffer::create(content.data(), content.length()));
   m_mainFrame->frame()->loader().load(
       FrameLoadRequest(0, ResourceRequest(m_url),
                        SubstituteData(buffer, "text/html", "UTF-8", KURL())));
 }
 
 void WebSharedWorkerImpl::didFinishDocumentLoad(WebLocalFrame* frame) {
+  DCHECK_EQ(frame, m_mainFrame);
   DCHECK(isMainThread());
   DCHECK(!m_loadingDocument);
   DCHECK(!m_mainScriptLoader);
   frame->dataSource()->setServiceWorkerNetworkProvider(
       WTF::wrapUnique(m_client->createServiceWorkerNetworkProvider()));
   m_mainScriptLoader = WorkerScriptLoader::create();
   m_mainScriptLoader->setRequestContext(
       WebURLRequest::RequestContextSharedWorker);
   m_loadingDocument = toWebLocalFrameImpl(frame)->frame()->document();
 
@@ skipping 237 matching lines @@
   if (devtoolsAgent)
     devtoolsAgent->dispatchOnInspectorBackend(sessionId, callId, method,
                                               message);
 }
 
 WebSharedWorker* WebSharedWorker::create(WebSharedWorkerClient* client) {
   return new WebSharedWorkerImpl(client);
 }
 
 }  // namespace blink