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A speculative fix for a 7%-19.2% regression of memory use. This
change releases the ZLib buffers used for Gzip inflation - releasing
the memory as soon as it is no longer needed instead of waiting for
the URLResponseBodyConsumer instance to be deleted.

This change also fixes an incorrect reset of |zlib_wrapper_|, which
was calling release() instead of reset(), when zlib would fail to
initialize. This was likely a latent bug and not the cause of
the regression.

Bug: 901891
Change-Id: I52687f5614b7a76c52f4b9d5317deb33a299e4cb
Reviewed-on: https://chromium-review.googlesource.com/c/1317922Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Chris Mumford <cmumford@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607124}