Fix typo in fast/event/touch/compositor touch tests.

I made a typo in r158331.

BUG=None
TBR=pdr

Review URL: https://codereview.chromium.org/24509006

git-svn-id: svn://svn.chromium.org/blink/trunk@158332 bbb929c8-8fbe-4397-9dbb-9b2b20218538