Widen Valgrind suppressions.

BUG=17540, 17979, 317666
TBR=oshima@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/71613004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234934 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234934