android: Use existing acitivty alias constant

Change-Id: I3c581c708164deb86641bbe178ed54fcb659e165
Reviewed-on: https://chromium-review.googlesource.com/c/1450022
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631493}
1 file changed