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Fix use-after-free which occured when a menu contained an item closing
it on a mouse press event. In such case MenuController object was freed
during a call of its OnMousePressed() but it continued to modify its
member variables.

Bug: 871205
Change-Id: Ic2a5dd3a745da6b0c1ef7a87f2cb498cc1a97234
Reviewed-on: https://chromium-review.googlesource.com/1163617Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584706}