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This CL also removed the unnecessary checks since destroy the Controller won't
change the raw pointer value in UiControllerAndroid.

Bug: 806868
Change-Id: Id23c0f73f2db236462e380e47b5836affefb5ef7
Reviewed-on: https://chromium-review.googlesource.com/c/1356121Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Commit-Queue: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613096}