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The QuicStreamFactory::OnJobComplete crash is gone in M63. This CL removes
the added CHECKs.

Bug: 750271
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Iee46a69d151be4c5e8ceb91c33ec63e445ede2fd
Reviewed-on: https://chromium-review.googlesource.com/766487Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515976}