suppress errors from content_browsertests to be investigated

TBR=bruening@chromium.org
BUG=371357, 371942, 371946, 371950, 371959

Review URL: https://codereview.chromium.org/275203002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269398 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed