The WebThreadedDataReceiver will now check if the parserthread is still alive before returning it to the ThreadedDataProvider
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: bf5cd6ccde378db821296732a091cfbcf5285fbd@176487 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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