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Prior to this CL, the outline focus color is gray outline. This has
been updated to white color based on the UX review.

Bug: 1146384
Change-Id: I6506f5116916087f5edc4fbf9a954c8b8310078d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2524826Reviewed-by: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Yu Han <yuzhehan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825387}