Bug 941129 - Fix getAllCookies not matching WebDriver command. r=dburns, a=test-only

The protocol command getAllCookies remains for backwards compatibility.
Bug 941136 - getUrl not matching webdriver command getCurrentUrl. r=dburns, a=test-only
Bug 941132 - getElementPosition not matching webdriver command. r=dburns, a=test-only
Bug 961802 - Plug leak in getUserMedia Denied code-path. r=jesup, a=sledru
Bug 941145 - Rename goUrl to get for WebDriver compatibility. r=dburns, a=test-only
Bug 941148 - Rename screenShot to takeScreenshot for webdriver compliance. r=dburns, a=test-only