The WebThreadedDataReceiver will now check if the parserthread is still alive...

The WebThreadedDataReceiver will now check if the parserthread is still alive before returning it to the ThreadedDataProvider

This fixes a crash when a renderer is shut down while a request is still alive, due to the ResourceDispatcher being shut down after Blink is.

R=abarth
BUG=386383

Review URL: https://codereview.chromium.org/345663002

git-svn-id: svn://svn.chromium.org/blink/trunk@176487 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp

@@ -85,14 +85,17 @@ public:
     // WebThreadedDataReceiver
     virtual void acceptData(const char* data, int dataLength) OVERRIDE FINAL
     {
-        ASSERT(backgroundThread()->isCurrentThread());
+        ASSERT(backgroundThread() && backgroundThread()->isCurrentThread());
         if (m_backgroundParser.get())
             m_backgroundParser.get()->appendRawBytesFromParserThread(data, dataLength);
     }
 
     virtual blink::WebThread* backgroundThread() OVERRIDE FINAL
     {
-        return &HTMLParserThread::shared()->platformThread();
+        if (HTMLParserThread::shared())
+            return &HTMLParserThread::shared()->platformThread();
+
+        return 0;
     }
 
 private: