Tidy up CompositorWorkerManager unit tests.

Source/core/workers/WorkerObjectProxy.cpp

 /*
  * 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 26 matching lines @@
 #include "core/dom/ExecutionContext.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/workers/WorkerMessagingProxy.h"
 #include "platform/NotImplemented.h"
 #include "wtf/Functional.h"
 
 namespace blink {
 
 PassOwnPtr<WorkerObjectProxy> WorkerObjectProxy::create(ExecutionContext* executionContext, WorkerMessagingProxy* messagingProxy)
 {
+    ASSERT(messagingProxy);
     return adoptPtr(new WorkerObjectProxy(executionContext, messagingProxy));
 }
 
 void WorkerObjectProxy::postMessageToWorkerObject(PassRefPtr<SerializedScriptValue> message, PassOwnPtr<MessagePortChannelArray> channels)
 {
     m_executionContext->postTask(FROM_HERE, createCrossThreadTask(&WorkerMessagingProxy::postMessageToWorkerObject, m_messagingProxy, message, channels));
 }
 
 void WorkerObjectProxy::postTaskToMainExecutionContext(PassOwnPtr<ExecutionContextTask> task)
 {
@@ skipping 43 matching lines @@
     m_executionContext->postTask(FROM_HERE, createCrossThreadTask(&WorkerMessagingProxy::workerThreadTerminated, m_messagingProxy));
 }
 
 WorkerObjectProxy::WorkerObjectProxy(ExecutionContext* executionContext, WorkerMessagingProxy* messagingProxy)
     : m_executionContext(executionContext)
     , m_messagingProxy(messagingProxy)
 {
 }
 
 } // namespace blink