Finish strong mode cleaning of dart2js.

pkg/compiler/lib/src/resolution/no_such_method_resolver.dart

Index: pkg/compiler/lib/src/resolution/no_such_method_resolver.dart
diff --git a/pkg/compiler/lib/src/resolution/no_such_method_resolver.dart b/pkg/compiler/lib/src/resolution/no_such_method_resolver.dart
index 49f3353eff3df74309a00b132805a2af14a81609..41cef3ec7adac9eca141f18826ba6a2670b65724 100644
--- a/pkg/compiler/lib/src/resolution/no_such_method_resolver.dart
+++ b/pkg/compiler/lib/src/resolution/no_such_method_resolver.dart
@@ -52,6 +52,7 @@ class ResolutionNoSuchMethodResolver implements NoSuchMethodResolver {
           arg.argumentsNode == null &&
           arg.receiver == null &&
           arg.selector is Identifier &&
+          // ignore: UNDEFINED_GETTER

[ahe, 2017/06/15 09:36:39]

Type of arg is *known* to be Send due to is test, so arg.selection has a known
type that has no source argument. I don't know how to fix this.

[Johnni Winther, 2017/06/15 10:21:26]

We probably need to nest ifs to make 'arg.selector' a local.

[ahe, 2017/06/15 11:41:57]

Done.

           arg.selector.source == param) {
         return true;
       }