Further reduce use of Element in codegen.

pkg/compiler/lib/src/js_emitter/code_emitter_task.dart

Index: pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
diff --git a/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart b/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
index 9c392296e5736d165e9aba8fca8aa99ab44a8869..0cc5b97f16e54d0f90c015ec997280d9a1b4328d 100644
--- a/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
+++ b/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
@@ -122,7 +122,7 @@ class CodeEmitterTask extends CompilerTask {
   /// Returns the JS expression representing the type [e].
   ///
   /// The given type [e] might be a Typedef.
-  jsAst.Expression typeAccess(Element e) {
+  jsAst.Expression typeAccess(Entity e) {
     return emitter.typeAccess(e);
   }
 
@@ -214,7 +214,7 @@ abstract class Emitter {
   jsAst.Expression interceptorClassAccess(ClassElement e);
 
   /// Returns the JS expression representing the type [e].
-  jsAst.Expression typeAccess(Element e);
+  jsAst.Expression typeAccess(Entity e);
 
   /// Returns the JS expression representing a function that returns 'null'
   jsAst.Expression generateFunctionThatReturnsNull();