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Since multiple transactions can now be added to Writers, those transactions will have a WRITE
bit set. Thus remove the DCHECKS that assume otherwise in HttpCache::DoneWithResponseHeaders.

Bug: 750725
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I791177522956ca23d6702254bbf7ee0b25c83bdf
Reviewed-on: https://chromium-review.googlesource.com/760540Reviewed-by: Randy Smith <rdsmith@chromium.org>
Commit-Queue: Shivani Sharma <shivanisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515459}