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Before this patch, the navigation detection logic for what happens
during a prompt (a script is running with a touchable element area) was
incorrect:
 - it was too trigger happy, disallowing navigation for other frames,
   such when fetching data in the background
 - it did not detect usage of the back button

With this patch, during a prompt, only non-renderer initiated navigation
is disabled. That includes hitting the back button or refreshing the
page through the UI, but not clicking on a link or Javascript-triggered
navigation.

From the user's point of view, with this patch, scripts won't randomly
fail during prompt anymore.

Change-Id: I0d825eeae596503e80d27e5ab032eee7e966ea4c
Bug: 911108
Reviewed-on: https://chromium-review.googlesource.com/c/1358496Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613101}