Added a new suppression for invalid write in...

Added a new suppression for invalid write in WebDataService::InitializeDatabaseIfNecessary (bug 50968)

TBR=jorlow
BUG=50968

Review URL: http://codereview.chromium.org/6005009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@70336 0039d316-1c4b-4281-b951-d872f2087c98