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android_tools/sdk/tools/proguard/bin/proguard.sh was removed with SDK tools
update. https://gerrit.chromium.org/gerrit/#/c/70802/ updates SDK tools
and we want to roll to start using it.

BUG=393019

Review URL: https://codereview.chromium.org/377353003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282498 0039d316-1c4b-4281-b951-d872f2087c98