Add console message levels to test expectation output.

Rather than tagging every console message with "CONSOLE MESSAGE", this
patch adds the message level. "CONSOLE ERROR" and "CONSOLE WARNING", for
instance ("CONSOLE DEBUG" is less awesome, but whatever).

This requires touching practically every test expectation ever. Sorry. :(

R=jochen@chromium.org

Review URL: https://codereview.chromium.org/26770004

git-svn-id: svn://svn.chromium.org/blink/trunk@159570 bbb929c8-8fbe-4397-9dbb-9b2b20218538