Do not use real URLs in the WebFrameTest

Instead of using http://www.test.com etc we now make use of the
*.test URLs as used by the W3C tests.

Review URL: https://codereview.chromium.org/638613002

git-svn-id: svn://svn.chromium.org/blink/trunk@183394 bbb929c8-8fbe-4397-9dbb-9b2b20218538