GitLab

This reverts commit 5d480c70.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 556549 as the
culprit for failures in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzVkNDgwYzcwNDk5NGVhODJjNGYzY2ExZmQ5NGIxNzYxNjY4YzY4NDkM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.chromiumos/linux-chromeos-dbg/5560

Sample Failed Step: browser_tests

Original change's description:
> Mash - Support for browser themes in window frame.
> 
> 1. Move BrowserFrameHeaderAsh to //ash/frame and rename to
>    CustomFrameHeader.
> 2. Use CustomFrameHeader for browser windows (in HeaderView).
>    Continue to use DefaultFrameHeader for other windows.
>    Possible TODO: share more code between the two FrameHeader classes.
> 3. Transport frame images over mojo so Mash can apply them
>    via CustomFrameHeader.
> 
> For now, only the active frame image is propagated (as a POC).
> The inactive image, overlay images, and frame colors are TODO.
> Ideally, there should be no behavioral changes in classic Ash.
> 
> BUG=704942,836992
> 
> Change-Id: I15b2d357bd3c8b60b6656ebce910d476ce107b44
> Reviewed-on: https://chromium-review.googlesource.com/1043221
> Reviewed-by: Tom Sepez <tsepez@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Evan Stade <estade@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#556549}

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
BUG=704942,836992

Change-Id: Ibe6fc13c61d33eac241fed00edb194cc248429de
Reviewed-on: https://chromium-review.googlesource.com/1049145
Cr-Commit-Position: refs/heads/master@{#556631}