Reenable deprecation warnings on Android framework.

Most recently introduced here: https://codereview.chromium.org/304333002

It appears these are not currently needed (I just disabled it and
successfully built).

Since we appear to be out of the transitional period, I propose we
remove them so we can know if we deprecate something Android uses
(and fix the call site).

Review URL: https://codereview.chromium.org/696063006
1 file changed