Changed directory that BrowserTestPortOverrides looks for test files in. BrowserTestDriver now sends a message to the browser test to quit.


Layout tests cleanly tells the browser test to quit.

BUG=388517

Review URL: https://codereview.chromium.org/413923002

git-svn-id: svn://svn.chromium.org/blink/trunk@178897 bbb929c8-8fbe-4397-9dbb-9b2b20218538