Fix hints reported by analyzer.

pkg/compiler/lib/src/js_backend/backend.dart

Index: pkg/compiler/lib/src/js_backend/backend.dart
diff --git a/pkg/compiler/lib/src/js_backend/backend.dart b/pkg/compiler/lib/src/js_backend/backend.dart
index 2aa41562cdad0730035a80c0d622ac9878124be8..2ef4fcb6a563ad6b5b9005e3edab1f0d6f093abf 100644
--- a/pkg/compiler/lib/src/js_backend/backend.dart
+++ b/pkg/compiler/lib/src/js_backend/backend.dart
@@ -898,7 +898,8 @@ class JavaScriptBackend extends Backend {
     if (elements.isEmpty) return false;
     return elements.any((element) {
       return selector.applies(element) &&
-          (mask == null || mask.canHit(element, selector, _closedWorld));
+          (mask == null ||
+              mask.canHit(element as MemberElement, selector, _closedWorld));

[Siggi Cherem (dart-lang), 2017/01/20 18:12:32]

may be we can change the type of [elements] above in 887 and 889 to be
Set<MemberElement> instead, , and [interceptedMembers] to Map<String,
Set<MemberElement>>?

[Johnni Winther, 2017/01/23 09:31:55]

I'll do that in a later CL. This is ok for now.

     });
   }