Add valgrind suppression for bug 330870

Add valgrind suppressions for leaks related to bug 330870.

BUG=330870
NOTRY=true
R=nasko@chromium.org

Review URL: https://codereview.chromium.org/121793002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242626 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242626