[Ozone] Fix ScreenPositionControllerTest.ConvertHostPointToScreen*

Ozone mimics the same display layout as X11, so use the same logic when
converting the position.

BUG=398888
NOTRY=true

Review URL: https://codereview.chromium.org/440133002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287945 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed