REGRESSION(127490): fast/canvas/canvas-toDataURL-webp.html crashing in debug linux

Add variable removed on r127490 back.

BUG=none
TEST=no crash


Review URL: http://codereview.chromium.org/9853007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@129144 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed