Provide correct bug number for inspector/profiler/canvas2d/canvas2d-gradient-capturing.html

BUG=260655
TBR=senorblanco@chromium.org

Review URL: https://codereview.chromium.org/19278011

git-svn-id: svn://svn.chromium.org/blink/trunk@154282 bbb929c8-8fbe-4397-9dbb-9b2b20218538