Valgrind: Suppress/widen a bunch of layout test errors.

NOTRY=true
TBR=thakis@chromium.org
BUG=162825,293049,332271,332328,332329,332330,332335

Review URL: https://codereview.chromium.org/127933002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243553 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243553