[chromium] Rebaseline and optimise fast/regions/full-screen-video-from-region on Win7 and Win XP

Unreviewed gardening.

* platform/chromium-win/fast/regions/full-screen-video-from-region-expected.png: Renamed from LayoutTests/platform/chromium-win-xp/fast/regions/full-screen-video-from-region-expected.png.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@139163 268f45cc-cd09-0410-ab3c-d52691b4dbfc