Finish strong mode cleaning of dart2js.

pkg/compiler/lib/src/inferrer/type_graph_nodes.dart

Index: pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
diff --git a/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart b/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
index 96b5923ab496dc6d4f5ba1a8d4ff2dbef7df3af6..639f047d0c940948d5b24f614abf22fdb8814f64 100644
--- a/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
+++ b/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
@@ -994,7 +994,8 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
       // Add calls to new targets to the graph.
       targets
           .where((target) => !oldTargets.contains(target))
-          .forEach((MemberElement element) {
+          .forEach((MemberEntity _element) {
+        MemberElement element = _element;
         MemberTypeInformation callee =
             inferrer.types.getInferredTypeOf(element);
         callee.addCall(caller, call);
@@ -1007,7 +1008,8 @@ class DynamicCallSiteTypeInformation extends CallSiteTypeInformation {
       // Walk over the old targets, and remove calls that cannot happen anymore.
       oldTargets
           .where((target) => !targets.contains(target))
-          .forEach((MemberElement element) {
+          .forEach((MemberEntity _element) {
+        MemberElement element = _element;
         MemberTypeInformation callee =
             inferrer.types.getInferredTypeOf(element);
         callee.removeCall(caller, call);
@@ -1368,7 +1370,7 @@ class ListTypeInformation extends TypeInformation with TracedTypeInformation {
   }
 
   TypeMask computeType(InferrerEngine inferrer) {
-    var mask = type;
+    dynamic mask = type;
     if (!mask.isContainer ||
         mask.elementType != elementType.type ||
         mask.length != inferredLength) {