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Refactor, minimize and clean up code. Moved the non-refresh/non-touch
tab close button highlight colors to theme_properties.cc since there
was a theme element.

It's still using the close (X) icons instead of painting them since the
coordinates of the strokes are very odd. Also, the "touch" version of the
icon drawn by outlining the X with a complicated path.

Once actual specs for the icon are available, the code can be updated.

TBR=estade@chromium.org

Bug: 838152
Change-Id: I2abca3be74f08649b3472f22fa31d0f897789e70
Reviewed-on: https://chromium-review.googlesource.com/1145590Reviewed-by: Sidney San Martín <sdy@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577196}