Remove rogerta@ as owner

rogerta@ has indicated that he should no longer be an owner of
depot_tools.

Review URL: https://codereview.chromium.org/1673313006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@298683 0039d316-1c4b-4281-b951-d872f2087c98

OWNERS

@@ -10,7 +10,6 @@ nodir@chromium.org
 petermayo@chromium.org
 pgervais@chromium.org
 phajdan.jr@chromium.org
-rogerta@chromium.org
 stip@chromium.org
 tandrii@chromium.org