Make hashCode a getter and not a method.

lib/compiler/implementation/js_backend/namer.dart

Index: lib/compiler/implementation/js_backend/namer.dart
diff --git a/lib/compiler/implementation/js_backend/namer.dart b/lib/compiler/implementation/js_backend/namer.dart
index 21c46c34c39fec3d31ca1f5df2f27fe6c4d66590..44470d1b4cf774946b40e24658b4e1bb7b5cc260 100644
--- a/lib/compiler/implementation/js_backend/namer.dart
+++ b/lib/compiler/implementation/js_backend/namer.dart
@@ -82,6 +82,10 @@ class Namer {
     return 'c\$${target.nestingLevel}';
   }
 
+  /**
+   * If the [name] is not private returns [:name.slowToString():]. Otherwise
+   * mangles the [name] so that each library has a unique name.
+   */
   String privateName(LibraryElement lib, SourceString name) {
     if (name.isPrivate()) {
       String nameString = name.slowToString();
@@ -163,6 +167,13 @@ class Namer {
     return 'set\$$fieldName';
   }
 
+  String publicGetterName(SourceString name) {
+    // We dynamically create getters from the field-name. The getter name must
+    // therefore be derived from the instance field-name.
+    String fieldName = safeName(name.slowToString());
+    return 'get\$$fieldName';
+  }
+
   String getterName(LibraryElement lib, SourceString name) {
     // We dynamically create getters from the field-name. The getter name must
     // therefore be derived from the instance field-name.