Gardening: Disable two failing tests.

plugins/touch-events-details.html
plugins/transformed-events.html

They were regressed by jdduke@ at #294250 (dd03ea640f54cd5b6e8b718cb4ab754918d9701a)

BUG=413098
TBR= jianli@chromium.org, jdduke@chromium.org,
NOTRY=true

Review URL: https://codereview.chromium.org/564673002

git-svn-id: svn://svn.chromium.org/blink/trunk@181794 bbb929c8-8fbe-4397-9dbb-9b2b20218538