Revert of [DevTools] Remove extra plumbing from InspectorWorkerAgent, prepare to multi-client.

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 212 matching lines @@
     // Not supported in SharedWorker.
 }
 
 void WebSharedWorkerImpl::postMessageToPageInspector(const String& message)
 {
     m_mainFrame->frame()->document()->postInspectorTask(BLINK_FROM_HERE, createCrossThreadTask(&WebSharedWorkerImpl::postMessageToPageInspectorOnMainThread, this, message));
 }
 
 void WebSharedWorkerImpl::postMessageToPageInspectorOnMainThread(const String& message)
 {
-    m_workerInspectorProxy->dispatchMessageFromWorker(message);
+    WorkerInspectorProxy::PageInspector* pageInspector = m_workerInspectorProxy->pageInspector();
+    if (!pageInspector)
+        return;
+    pageInspector->dispatchMessageFromWorker(message);
+
 }
 
 void WebSharedWorkerImpl::workerGlobalScopeClosed()
 {
     Platform::current()->mainThread()->getWebTaskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(&WebSharedWorkerImpl::workerGlobalScopeClosedOnMainThread, AllowCrossThreadAccess(this)));
 }
 
 void WebSharedWorkerImpl::workerGlobalScopeClosedOnMainThread()
 {
     m_client->workerContextClosed();
@@ skipping 146 matching lines @@
     if (devtoolsAgent)
         devtoolsAgent->dispatchOnInspectorBackend(sessionId, message);
 }
 
 WebSharedWorker* WebSharedWorker::create(WebSharedWorkerClient* client)
 {
     return new WebSharedWorkerImpl(client);
 }
 
 } // namespace blink