Step down as OWNER for screen_orientation module

Step down as OWNER for screen_orientation module. I am moving on to new things
and I will no longer be able to be as active as I was in Blink. It is best to
remove my email from OWNERS files to avoid confusion.

TBR=mlamouri@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/494733004

git-svn-id: svn://svn.chromium.org/blink/trunk@180697 bbb929c8-8fbe-4397-9dbb-9b2b20218538