Remove ARC IMEs from prefs in Shutdown().

These prefs should be removed in Shutdown() instead of the destructor
because in the destructor Profile is already destructing.

Bug: b/123020953
Test: Not crash when logging out.
Change-Id: I8a9b728e9e0b032dbaebbe2d59dc0ac5134c4e12
Reviewed-on: https://chromium-review.googlesource.com/c/1426347
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625058}
2 files changed