Add deprecated annotation for events in API documentation.

Example Image: http://i.imgur.com/u6f6Ewh.png

NOTRY=true
BUG=239196

Review URL: https://codereview.chromium.org/53403004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233032 0039d316-1c4b-4281-b951-d872f2087c98
net: trim allowed Google pins now that we have switched to GIAG2.

BUG=none
R=palmer@chromium.org

Review URL: https://codereview.chromium.org/55893003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233033 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233033