Update a TSan suppression for the misterious UserScriptMaster race
RunScan was renamed to RunLoad
BUG=67957
TBR=glider
TEST=TSan/UI is more stable
Review URL: http://codereview.chromium.org/7195001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89330 0039d316-1c4b-4281-b951-d872f2087c98