Add easy unlock owners.

BUG=None
R=rogerta@chromium.org

Review URL: https://codereview.chromium.org/445513003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287631 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/signin/OWNERS

 atwilson@chromium.org
 tim@chromium.org
 rogerta@chromium.org
+
 # Temporary, for refactoring purposes only.
 blundell@chromium.org
+
+per-file easy_unlock_*=isherman@chromium.org
+per-file easy_unlock_*=tbarzic@chromium.org
+per-file easy_unlock_*=tengs@chromium.org
+per-file easy_unlock_*=xiyuan@chromium.org