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The chrome://weblayer page was not loading. This adds the necessary
resources to webview/monochrome.

Bug: 1017924
Change-Id: Iaa3831afa9408c271720e378f5893b8b0d019a97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880171Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709538}