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This reverts commit 8dc97871.

Reason for revert: Broke compile for android-rel
https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8928477879975314896/+/steps/compile/0/stdout

Original change's description:
> Android: Using R8 instead of ProGuard for public targets
> 
> Bug: 908988
> Change-Id: Iaaee8124c56945a8769e6d4ff2a0859ef39c1aea
> Reviewed-on: https://chromium-review.googlesource.com/c/1355424
> Reviewed-by: agrieve <agrieve@chromium.org>
> Commit-Queue: Sam Maier <smaier@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#612439}

TBR=agrieve@chromium.org,smaier@chromium.org

Change-Id: I6cdf8fd95b254abe733426f9e38aa1446661f9e8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 908988
Reviewed-on: https://chromium-review.googlesource.com/c/1356229Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612483}