navigator.connection.type's value can easily change for a given
platform over time.  Not worth constantly rebaselining.  Remove
navigator.connection.type from window tests as it's already well
tested in netinfo/* tests.

BUG=381683

Review URL: https://codereview.chromium.org/356833006

git-svn-id: svn://svn.chromium.org/blink/trunk@177119 bbb929c8-8fbe-4397-9dbb-9b2b20218538