In order for a phone manufacturer to get the Google seal of approval (which allows you to bundle up the Android Market and various Google Apps in your distribut

In order for a phone manufacturer to get the Google seal of approval (which allows you to bundle up the Android Market and various Google Apps in your distribution) their "fork" of Android has to pass a suite of compatibility and assurance tests. Google could simply add that functionality as being required in the test suite to force the phone carriers not to muck with it.