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/compiler/test/aot/compiler_spec.ts

@@ -279,7 +279,6 @@ describe('compiler (unbundled Angular)', () => {
          const host = new MockCompilerHost(['/app/app.ts'], FILES, angularFiles);
          const aotHost = new MockAotCompilerHost(host);
          let generatedFiles: GeneratedFile[];
-         const warnSpy = spyOn(console, 'warn');
          compile(host, aotHost, expectNoDiagnostics).then((f) => generatedFiles = f);
 
          tick();