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This reverts commit 4a7db45d.

Reason for revert: DraggableButtonTest.ActsOnMouseDownIgnoredForCommandClick fails on Mac10.12 bot, e.g.
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.12%20Tests/12756 (test times out)

Original change's description:
> Mac: Don't trigger mouse down events on bookmark buttons if command key is down
> 
> Currently, all clicks on a bookmark folder button trigger their action on
> mouse down, so that the folder menu can open on mouse down as expected.
> 
> This also includes command click, which, rather than opening the folder menu,
> opens all the bookmarks in the folder as new tabs. This isn't desirable since:
> - The expected behavior is that button clicks trigger on mouse up.
> - Triggering this on mouse down interacts poorly with the nested run loop
> created by the confirmation dialog we display when the folder has many links.
> 
> This change causes the action to no longer fire on mouse down if the user
> is command-clicking the folder button.
> 
> Bug: 840387
> Change-Id: Ic1364160cf26f2f3ea6e67d7dd0d6cf5079082eb
> Reviewed-on: https://chromium-review.googlesource.com/1053947
> Reviewed-by: Robert Sesek <rsesek@chromium.org>
> Commit-Queue: Leonard Grey <lgrey@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#557676}

TBR=rsesek@chromium.org,lgrey@chromium.org

Change-Id: Iafb3cc8af01be9ba50a5e944b44750c62ee1df84
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 840387
Reviewed-on: https://chromium-review.googlesource.com/1055027Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557760}