Remove all methods from ShadowListActivity. We kept it around because it has
a subclass.

setListAdapter would throw an exception unless setContentView was called
beforehand - something that is not necessary when using the real ListActivity

Other methods were removed because the real object seems to work fine.
Fully remove ShadowListActivity
Don't use glob-style import statements
Delete unused class
Merge pull request #644 from seadowg/list-activity

Remove all methods from ShadowListActivity.