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This patch fixes modal permission prompts so that in RTL:
- The text direction is RTL as per the locale, instead of following the
  first strong directional character (typically the first character of
  the URL)
- The icon occurs on the right side of the dialog (i.e. before it)

Bug: 774926
Change-Id: I8677cf61c30bdce95113e0e414531c343ed302c2
Reviewed-on: https://chromium-review.googlesource.com/722382Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509637}