feat(upgrade): use ComponentFactory.inputs/outputs/ngContentSelectors

DEPRECATION:
- the arguments `inputs` / `outputs` / `ngContentSelectors` of `downgradeComponent`
  are no longer used as Angular calculates these automatically now.
- Compiler.getNgContentSelectors is deprecated. Use
  ComponentFactory.ngContentSelectors instead.

packages/upgrade/test/static/integration/examples_spec.ts

@@ -71,9 +71,7 @@ export function main() {
                        };
                      })
                  // This is wrapping (downgrading) an Angular component to be used in AngularJS
-                 .directive(
-                     'ng2',
-                     downgradeComponent({component: Ng2Component, inputs: ['nameProp: name']}));
+                 .directive('ng2', downgradeComponent({component: Ng2Component}));
 
          // This is the (AngularJS) application bootstrap element
          // Notice that it is actually a downgraded Angular component