Creates an instance of goog.net.NetworkTester which can be used to test
for internet connectivity by seeing if an image can be loaded from
google.com. It can also be tested with other URLs.
new NetworkTester( callback, opt_handler, opt_uri )
| Parameters | | callback | (Function|null) | | Callback that is called when the test completes.
The callback takes a single boolean parameter. True indicates the URL
was reachable, false indicates it wasn't.
| | opt_handler | (Object|null)= | | Handler object for the callback.
| | opt_uri | (goog.Uri|null)= | | URI to use for testing.
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