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TEST=manually tested with chrome://user-actions/
BUG=921250

Change-Id: I914462bf6fda10e9fd3d88d0f808ae04a44130ca
Reviewed-on: https://chromium-review.googlesource.com/c/1488173
Commit-Queue: Tim Song <tengs@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635928}