Fix one more test that I broke in r158331.

Turns out that in the old code, if you passed in 1 to dumpAsText,
it would treat that as false.

BUG=None
TBR=pdr

Review URL: https://codereview.chromium.org/24479005

git-svn-id: svn://svn.chromium.org/blink/trunk@158333 bbb929c8-8fbe-4397-9dbb-9b2b20218538