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https://i.imgur.com/JebuYQs.png

This CL also refactors a bit of the HTML and CSS of the bookmark folder
nodes to make it a bit easier to resize the indents.

Change-Id: Iab935570bf9f6bc695b59c1b894240f4f1171a13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1618265
Commit-Queue: John Lee <johntlee@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663879}