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This patch fixes the placement and color of image buttons in
search_box_view. Previously, the right padding was not calculated and
close button was using search box color.

Bug: 941524
Test: manual
Change-Id: I201b21257a11e188490136b05ac68dc5e15cebcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626735Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662909}