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This adds documentation that explains users must
allow file:// urls through extension management page

Bug: 850693
Change-Id: I214bd285c076babb4ba6a7769db4d4a9c54c1916
Reviewed-on: https://chromium-review.googlesource.com/1093257Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Crystal Lambert <crystallambert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567384}