GitLab

Remove the "CompressionStreams" flag and enable CompressionStream and
DecompressionStream by default.

See the "Intent to Ship" thread at
https://groups.google.com/a/chromium.org/d/msg/blink-dev/JmwpHPTu3XM/FQQ1fTwxBAAJ

BUG=999091

Change-Id: Ic97407e4391f2d0481aaeba1009c18706f036be1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1950370Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721871}