Make SampleApp work on iPhone/iOS simulator.

Make SampleApp work on iPhone/iOS simulator.

Several parts to this:

1) The DeviceManager subclass for iOS was rewritten because the base class changed.

2) Two old samples that rely on hardcoded paths to images are deleted. They hit assertions in SkImageRef. No one has the required images to run these anyway.

3) argv must be non-NULL.

4) The UI delegate must not be loaded from the NIB for viewDidLoad ordering reasons. So I removed an IBOutlet link from the window to the splitview controller in the iPad's NIB file. The split view is attached by the AppDelegate programmatically.

This doesn't make GPU work. That will come in a later change.

[bsalomon, 2012-09-27 15:12:54]

Adding Mike since Cary is out of the office today.

[reed1, 2012-09-27 15:24:33]

(closes eyes) LGTM

[bsalomon, 2012-09-27 16:05:06]

Checked in at r5712.