[iOS][Translate] Fixes translate infobar crashing in Release builds

Fixes the crash caused by |self.optionsButton| and |self.dismissButton|
being nil in release builds due to compiler optimization.

Bug: 910994
Change-Id: I5f158c1b1f0912d1ab0f33cbe8f0deb66a5b8068
Reviewed-on: https://chromium-review.googlesource.com/c/1452761
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Auto-Submit: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628873}
1 file changed