Decrease padding between bookmark-bar items

Gives 4dp of whitespace back to the user (in Refresh) by using
TOOLBAR_ELEMENT_PADDING. This unifies the bookmark item spacing with
toolbar items.

(cherry picked from commit c96fb3ee8abd6689133ba664af9f42ad7bb0a4b9)

(cherry picked from commit 9ba94382ad291d1c817788eab9a0f5a5335584ce)

Bug: chromium:848631
Change-Id: I20c2ea5735f93a4db2d7c7e6c218ed4bd528c458
Reviewed-on: https://chromium-review.googlesource.com/1152029
Commit-Queue: Peter Boström <pbos@chromium.org>
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Original-Original-Commit-Position: refs/heads/master@{#578426}
Reviewed-on: https://chromium-review.googlesource.com/1153727
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Original-Commit-Position: refs/branch-heads/3497@{#177}
Cr-Original-Branched-From: 271eaf50594eb818c9295dc78d364aea18c82ea8-refs/heads/master@{#576753}
Reviewed-on: https://chromium-review.googlesource.com/1154436
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/branch-heads/3440@{#768}
Cr-Branched-From: 010ddcfda246975d194964ccf20038ebbdec6084-refs/heads/master@{#561733}
1 file changed