Theme code cleanup.

Theme code cleanup.

* Remove some color constants that are never used.
* Remove some MD-specific constants in the Aura theme that are exactly the same
  as the non-MD constants.
* Pull pre-MD-specific cases out of the Windows code to avoid repeated
  conditional breaks.
* Rename/reorder Windows constants a bit in preparation for changing how MD
  works.

BUG=597754
TEST=none

Committed: https://crrev.com/9b55ff2e61b462dfb0c9b2ee86d43ea26df9a135
Cr-Commit-Position: refs/heads/master@{#400453}

[Peter Kasting, 2016-06-17 06:10:17]

pkasting@chromium.org changed reviewers:
+ estade@chromium.org

[Evan Stade, 2016-06-17 17:28:39]

lgtm

[Peter Kasting, 2016-06-17 17:56:52]

The CQ bit was checked by pkasting@chromium.org

[commit-bot: I haz the power, 2016-06-17 17:57:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2076893002/1

[commit-bot: I haz the power, 2016-06-17 18:03:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-17 18:04:54]

Description was changed from

==========
Theme code cleanup.

* Remove some color constants that are never used.
* Remove some MD-specific constants in the Aura theme that are exactly the same
  as the non-MD constants.
* Pull pre-MD-specific cases out of the Windows code to avoid repeated
  conditional breaks.
* Rename/reorder Windows constants a bit in preparation for changing how MD
  works.

BUG=597754
TEST=none
==========

to

==========
Theme code cleanup.

* Remove some color constants that are never used.
* Remove some MD-specific constants in the Aura theme that are exactly the same
  as the non-MD constants.
* Pull pre-MD-specific cases out of the Windows code to avoid repeated
  conditional breaks.
* Rename/reorder Windows constants a bit in preparation for changing how MD
  works.

BUG=597754
TEST=none

Committed: https://crrev.com/9b55ff2e61b462dfb0c9b2ee86d43ea26df9a135
Cr-Commit-Position: refs/heads/master@{#400453}
==========

[commit-bot: I haz the power, 2016-06-17 18:04:55]

Patchset 1 (id:??) landed as
https://crrev.com/9b55ff2e61b462dfb0c9b2ee86d43ea26df9a135
Cr-Commit-Position: refs/heads/master@{#400453}