- 
Tetsui Ohkubo authoredThe button on the right of the brightness sldier is no-op, so we should call SetEnabled(false). In order to do this, this CL changed disabled color of the buton icon. TEST=manual BUG=854148 Change-Id: I1f0e98540a86696351135275be8946b7250cbc12 Reviewed-on: https://chromium-review.googlesource.com/1107423Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org> Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org> Cr-Commit-Position: refs/heads/master@{#568752} 2e5de0eb