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The SyntheticDiversionListener needs to handle the case where the IPC connection is gone. This patch avoids calling Send* methods which will crash the content process if the actor has already been destroyed. Additionally, OnDataAvailable will return an error in such a case so that the caller can properly handle the error rather than continuing to attempt to send data to a listener that doesn't care. This latter change is an artifact of a previous hack attempt to fix a related diversion issue that is probably not required for this stack, but makes sense as a fix, so I've left it in. --HG-- extra : rebase_source : 824d4ab64e92ebb04d8d1ecd4df6d03a2cb37d2f