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This CL increases margin between the tiel and RHS icon in
preview tab.

Bug: 1047890
Change-Id: I96fcbd68b25a467c13a525d94c17976184812959
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032699Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737929}