Suppressions for memory waterfall:
 - Uninitialized read in ash::TouchUMA::RecordTouchEvent (issue 337462)
 - extend the suppressions for leaks in LoadNSSCertificates (issue 272596)

BUG=337462,272596
TBR=eugenis@chromium.org

Review URL: https://codereview.chromium.org/138083004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246602 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246602