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LoginExpandedPublicAccountView is a view subclass but also
a pretarget handler of Shell. This is not great since any of
touch events will invoke the final method View::OnTouchEvent().

This CL creates an event handler for this purpose rather than
using a view directly as a pretarget handler.

I expanded the test cases to examine both mouse events and touches,
and confirmed it causes the reported crashes with touches without
this fix.

Bug: 908890
Test: the new test cases
Change-Id: I45d7de7da1eca8f874f5774971a085af8f72c9eb
Reviewed-on: https://chromium-review.googlesource.com/c/1428607Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625315}