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Occasionally a WebContentController is destructed before we have received
RenderViewDeleted notifications for all observed RenderWidgetHosts.
Therefore, it is not safe to call RemoveInputEventObserver on every
RenderWidgetHost that we started observing; we need to remove only from
currently live RenderWidgetHosts.

Bug: b/148227677
Change-Id: Ic9a7a4f187eb154665fc2ad093dd9464f7520e27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020246
Commit-Queue: Kevin Schoedel <kpschoedel@chromium.org>
Reviewed-by: Albert Chaulk <achaulk@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737439}