Bug 1059245 - Update tests and framework to use the new Browser app

@chirarobert I don't see where in the code the `send` method is closing the keyboard. Is switching back to the displayed app causing it to lose focus?
I would create a new public method called tap_search_button in the Keyboard object, that represents the button on the keyboard and call that in the test.
I'd prefer not to overload this method with more options.