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This reverts commit 38b443b6.

Reason for revert: Build failures on https://ci.chromium.org/p/chrome/builders/ci/android-builder-perf, etc.

Original change's description:
> ProGuard: Move -checkdiscard for Log.* into @RemovableInRelease annotation
> 
> Strictly a refecator to cut down on number of explicit rules.
> 
> Change-Id: I3afad5ccd63d2347c69343df15014118780f512e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1711978
> Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> Reviewed-by: Sam Maier <smaier@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#679849}

TBR=agrieve@chromium.org,smaier@chromium.org,crouleau@chromium.org
Bug: 986693

Change-Id: I8a9849ff22206f4d4b320a25c47426980ee8a15c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1714217Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#679885}