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In order to fully fix the linked bug, I need to change the color of
this icon; doing that on a PNG is considerably painful. As such, this
change first switches from using the PNG to using a vector icon. That
allows cleaning up some bespoke image rendering code used with the
old PNG icon.

A followup CL will perform the actual color adjustment; this CL uses
the exact colors the old PNG used to avoid unnecessary visual changes.
The new Material icon does look slightly different from the old PNG,
but that delta (the icon being different) has been approved by UX.

TBR=oshima@chromium.org

Bug: 957391
Change-Id: I3787b561dbe15bf00977ad54dd57ce183115bbec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815733
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698792}