Enable back 4 tests for Debug builds.

BUG=352035
TBR=loislo@chromium.org

Review URL: https://codereview.chromium.org/201893002

git-svn-id: svn://svn.chromium.org/blink/trunk@169352 bbb929c8-8fbe-4397-9dbb-9b2b20218538