Remove the UseCounter entries for beforeload events

BUG=333318
NOTRY=true

Review URL: https://codereview.chromium.org/212883002

git-svn-id: svn://svn.chromium.org/blink/trunk@170122 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed
tree: 12013dca727235dd1b5a154bc5959b7e57919850
  1. third_party/