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Previously the width was 362px, which is 360px (notification width) plus 2px (notification border). This CL removes the border and shrinks the width of sidebar by 2px.

Bug: 726250
Change-Id: Iae5a14a9057561223e5e2afe39fee840a3073de1
Reviewed-on: https://chromium-review.googlesource.com/825042
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524353}