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This patch adds a command-line switch, --deny-permission-prompts, which
will suppress all permission prompts. This is intended for testing
purposes, where prompts (in particular modal prompts on Android) may
be irrelevant to but get in the way of tests. This is necessary for
telemetry tests, which currently fallback to infobar prompts on Android.

Bug: 762335
Change-Id: I6ad36b81ce6404da2c5e141b5fdca2692f37af35
Reviewed-on: https://chromium-review.googlesource.com/773768
Commit-Queue: Timothy Loh <timloh@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517260}