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Now the placeholder image's bounds are smaller than the available
drawing area. It brings white lines around the placeholder image, which
might be caused by the rendering code (note that we draw the placeholder
image through gfx::Canvas's APIs) The specific reason is unknown yet,
still under investigation. Given that the paddings of the placeholder
image are not really needed, they are removed by this CL.

Bug: 1163621
Change-Id: Ibe309ea5044ab2c411917bb4ffd9d58c9d33bc5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627433
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Auto-Submit: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843132}