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There are some crashes from |WebController| when resetting the keyboard
state through the |AutofillAgent|. These can happen if the
|RenderFrameHost| is no longer valid when the final callback to clean up
the state is executed.

Bug: 1119918
Change-Id: I9bcd69ae125a1ab7918bc5671cb3b95c4cc82d71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2396121
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Marian Fechete <marianfe@google.com>
Reviewed-by: Maxim Kolosovskiy  <kolos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805275}