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This reverts commit 3b7859cb.

Reason for revert: Reverting in hopes of get unit_tests passing on chromeos bot. This appears to be next in the chain to revert.

Original change's description:
> Add background tab text colors for inactive and incognito windows.
> 
> With the default behavior of Chrome being to not show a tab background, we want
> to change themes to default to that as well, unless the theme author actually
> supplies an image/color for this explicitly.  To do this, we need to support
> different tab text colors for the cases where the frame colors can vary.  This
> adds the framework for that support.
> 
> Right now, the default is to use the same text colors in inactive windows as
> active ones.
> 
> This also gives themes that want normal and incognito windows to differ greatly
> (as the built-in theme's does) the ability to implement that and still have
> readable tab titles.
> 
> Bug: 866672
> Change-Id: I032a72bc799d0675c517db10283513a30db23328
> Reviewed-on: https://chromium-review.googlesource.com/1152418
> Commit-Queue: Peter Kasting <pkasting@chromium.org>
> Reviewed-by: Evan Stade <estade@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#578807}

TBR=pkasting@chromium.org,estade@chromium.org,bsep@chromium.org

Change-Id: I5e3a5772cea3f7a0d3f790d27dcccc66c51cb161
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 866672
Reviewed-on: https://chromium-review.googlesource.com/1154067Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578860}