Late night strong mode cleaning.

pkg/compiler/lib/src/deferred_load.dart

Index: pkg/compiler/lib/src/deferred_load.dart
diff --git a/pkg/compiler/lib/src/deferred_load.dart b/pkg/compiler/lib/src/deferred_load.dart
index 971a1d98b3a1854a5a7b96cfd9bcc3d4a0c21419..77d9266b5a19fd28d376ec1dcd017154bb4fb5d6 100644
--- a/pkg/compiler/lib/src/deferred_load.dart
+++ b/pkg/compiler/lib/src/deferred_load.dart
@@ -444,7 +444,8 @@ class DeferredLoadTask extends CompilerTask {
       // If we see a class, add everything its live instance members refer
       // to.  Static members are not relevant, unless we are processing
       // extra dependencies due to mirrors.
-      void addLiveInstanceMember(_, MemberElement element) {
+      void addLiveInstanceMember(_, _element) {
+        MemberElement element = _element;
         if (!compiler.resolutionWorldBuilder.isMemberUsed(element)) return;
         if (!isMirrorUsage && !element.isInstanceMember) return;
         elements.add(element);