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This CL changes the GMC icon from the placeholder play button that
we've been using to the actual "queue music" icon we want to use. This
also fixes an issue where the icon was slightly too big for the
toolbar.

Bug: 973500, 994697
Change-Id: Idb011e4f420749280b15931651fd5134a8be755a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1802820Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696508}