TestExpectations update after blink r157905

Expect a couple of debug crashes due to legitimate bugs triggering asserts.

TBR=eseidel
BUG=294237,294238

Review URL: https://codereview.chromium.org/24226002

git-svn-id: svn://svn.chromium.org/blink/trunk@157972 bbb929c8-8fbe-4397-9dbb-9b2b20218538