Revert 253003 "This CL:"

Revert 253003 "This CL:"

likely cause of this failure
http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%282%29/builds/21812

OpenSpecialTypes/FileManagerBrowserTest.Test/0
OpenSpecialTypes/FileManagerBrowserTest.Test/1
OpenSpecialTypes/FileManagerBrowserTest.Test/2

> This CL:
> - Makes app windows and browser windows use different assets for the header and window controls
> - Removes the separator for the window controls
> - Changes FrameCaptionButton so that the buttons use separate assets for the button background and the button icon.
>
> BUG=297187
> TEST=Visual by kuscher@
> NOTRY=true
> R=jamescook@chromium.org
>
> Review URL: https://codereview.chromium.org/148003003

TBR=pkotwicz@chromium.org

Review URL: https://codereview.chromium.org/178843005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253046 0039d316-1c4b-4281-b951-d872f2087c98