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This CL addresses a crash when the user submits a password form while
Save Password message is on the screen. The problem is that the previous
message does not get dismissed.

This CL adds a call to dismiss a message before showing the new one. It
ensures that the dismiss callback is called synchronously on the native
side. It also ensures that dismiss callback doesn't get called again
from java when the message is hidden from the screen.

BUG=1153927
R=twellington@chromium.org

Change-Id: I2dd48e501d1eb3eb859784c429eaa6cbc5f8d610
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583113Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Pavel Yatsuk <pavely@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835715}