Remove unused color from NativeTheme.

Remove unused color from NativeTheme.

The "Divider" colors are intended for use for the hyphens that separate
e.g. the URL and page title. These hyphens actually just match the
DIMMED_TEXT color; I can't find a time in the past where this color was
ever used for anything.

BUG=501377
Committed: https://crrev.com/c9e3b72e0602b9a920d5d6aa90dc6a29b6eae5cd
Cr-Commit-Position: refs/heads/master@{#360436}

[Evan Stade, 2015-11-18 01:30:07]

estade@chromium.org changed reviewers:
+ erg@chromium.org, msw@chromium.org, pkasting@chromium.org

[Evan Stade, 2015-11-18 01:30:07]

+a lot of relevant people in hopes that, if this is flawed, at least one of them
will object

[Evan Stade, 2015-11-18 01:30:11]

The CQ bit was checked by estade@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-11-18 01:30:23]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1454983003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1454983003/1

[commit-bot: I haz the power, 2015-11-18 01:46:04]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-18 01:46:06]

Dry run: Try jobs failed on following builders:
  chromeos_amd64-generic_chromium_compile_only_ng on tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromeos_amd64-...)
  chromeos_daisy_chromium_compile_only_ng on tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromeos_daisy_...)
  chromeos_x86-generic_chromium_compile_only_ng on tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromeos_x86-ge...)
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Peter Kasting, 2015-11-18 01:46:12]

LGTM

[Elliot Glaysher, 2015-11-18 18:09:18]

lgtm

[msw, 2015-11-18 19:46:28]

ditto lgtm in case you're waiting for me

[Evan Stade, 2015-11-18 22:01:42]

The CQ bit was checked by estade@chromium.org

[Evan Stade, 2015-11-18 22:01:42]

The patchset sent to the CQ was uploaded after l-g-t-m from
pkasting@chromium.org
Link to the patchset: https://codereview.chromium.org/1454983003/#ps20001
(title: "rebase")

[commit-bot: I haz the power, 2015-11-18 22:04:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1454983003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1454983003/20001

[commit-bot: I haz the power, 2015-11-18 23:06:59]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-11-18 23:07:39]

Patchset 2 (id:??) landed as
https://crrev.com/c9e3b72e0602b9a920d5d6aa90dc6a29b6eae5cd
Cr-Commit-Position: refs/heads/master@{#360436}