Reimplement agent.setWindowSize

[eliseosoto]

The current implementation injects javascript into the browser to create and manipulate windows.

Currently there are window resources in WebDriver that can do the same thing without using Javascript.

http://code.google.com/p/selenium/wiki/JsonWireProtocol#/session/:sessionId/window/:windowHandle/size

There's even a maximize operation that could be used to implement #1