Element-model refactoring.

sdk/lib/_internal/compiler/implementation/js_backend/backend.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
index c7658451370fe80ae9ccfb97155f98f38b9c249b..45b3adac2d1708bf06cde49d48f655bbc75beb05 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
@@ -417,7 +417,7 @@ class JavaScriptBackend extends Backend {
 
   bool usedByBackend(Element element) {
     if (element.isParameter
-        || element.isFieldParameter
+        || element.isInitializingFormal
         || element.isField) {
       if (usedByBackend(element.enclosingElement)) return true;
     }
@@ -425,7 +425,7 @@ class JavaScriptBackend extends Backend {
   }
 
   bool invokedReflectively(Element element) {
-    if (element.isParameter || element.isFieldParameter) {
+    if (element.isParameter || element.isInitializingFormal) {
       ParameterElement parameter = element;
       if (invokedReflectively(parameter.functionDeclaration)) return true;
     }