commit 3d4a5bf34e773cdf3410fb27d9d07e50b34996af
author DongJun Kim <djmix.kim@samsung.com> Thu Jul 27 17:10:47 2017
committer Commit Bot <commit-bot@chromium.org> Thu Jul 27 17:10:47 2017
tree ea74b4f8d4b50510b77092dc903b04ca93179c5b
parent 38f01d48d61331a04e9789ef35bf7486840ab9af

Check nullptr before using in FireWinAccessibilityEvent

Previous codes can occur crash when calling
GetRole() or GetBoolAttribute() if target is nullptr.
This patch check null pointer before using it
to prevent crash.

BUG=NONE

Change-Id: Ia65c0e0834bebf3be71caa991e65e721f4640e68
Reviewed-on: https://chromium-review.googlesource.com/587513
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489992}