[MemSheriff] More parseUA suppressions

There are two variants of parseUA, disabling both.
Also, disabling parseUA leaks found by heapcheck.

NOTRY=true
R=dglazkov@chromium.org
TBR=dglazkov@chromium.org, thestig@chromium.org
BUG=121729

Review URL: https://codereview.chromium.org/64623005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234000 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234000