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This reverts commit 0e0ca1fb.

Reason for revert: Broke compile on Android Arm64 Builder (dbg): https://build.chromium.org/p/chromium.linux/builders/Android%20Arm64%20Builder%20%28dbg%29

Original change's description:
> Android: Turn on UnusedResources lint check
> 
> Fixes current lint warnings and starts to remove obsolete old
> suppressions. Moving towards a world where we have as few suppressions
> as possible.
> 
> Bug: 731159
> Change-Id: If960d984b0906b80d3cd8c504a0d0af83f6a8a89
> Reviewed-on: https://chromium-review.googlesource.com/578488
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Reviewed-by: Xi Han <hanxi@chromium.org>
> Reviewed-by: Yuwei Huang <yuweih@chromium.org>
> Commit-Queue: Peter Wen <wnwen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#488307}

TBR=wnwen@chromium.org,hanxi@chromium.org,agrieve@chromium.org,yuweih@chromium.org

Change-Id: I7dc0c54b509fe2597a38bb6d660d9c4e7232321d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 731159
Reviewed-on: https://chromium-review.googlesource.com/579749Reviewed-by: Scott Little <sclittle@chromium.org>
Commit-Queue: Scott Little <sclittle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488314}