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This reverts commit 6e443093.

Reason for revert: Causes failures on WebKit Linux Leaks and Webkit Linux MSAN, see https://crbug.com/1012652

Original change's description:
> CompressionStream
> 
> Implement compression for "gzip" and "deflate". That implementation is
> hidden behing ExperimentalCompressionStream flag.
> 
> For unit tests, we compress and stream and uncompress it with pako, and
> we make sure its output is the same as our original data.
> 
> Change-Id: I89dde0e06a07b695be93a3b4f81fa6b3ee80d760
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763344
> Commit-Queue: Adam Rice <ricea@chromium.org>
> Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Reviewed-by: Adam Rice <ricea@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#704009}

Bug: 1012652
TBR=kinuko@chromium.org,ricea@chromium.org,yhirano@chromium.org,robertma@chromium.org,acomminos@fb.com,arenevier@fb.com

Change-Id: I3d57975faa0206478048f518b53dcb617192b016
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849376Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704123}