Privacy Browser Android

This will be a rolling fork composed of a series of minimally invasive patches that will be rebased on each upstream release of Android's WebView. API compatibility will be maintained with WebView, in the sense that no methods will be removed (although some might become a NOOP or otherwise be modified). New methods will also be added providing increased privacy controls. This design will allow Privacy WebView to replace Android's WebView on custom ROMs without breaking other programs that use WebView.