Use JavaFile instead of Dart File.

pkg/analyzer-experimental/test/generated/element_test.dart

Index: pkg/analyzer-experimental/test/generated/element_test.dart
diff --git a/pkg/analyzer-experimental/test/generated/element_test.dart b/pkg/analyzer-experimental/test/generated/element_test.dart
index bb3470f3ab29947dc7c17f32eed8a77316d33e07..9bd59844d6c563e11ee13b637deb563c572bbf17 100644
--- a/pkg/analyzer-experimental/test/generated/element_test.dart
+++ b/pkg/analyzer-experimental/test/generated/element_test.dart
@@ -148,10 +148,10 @@ class LibraryElementImplTest extends EngineTestCase {
         final __test = new LibraryElementImplTest();
         runJUnitTest(__test, __test.test_getImportedLibraries);
       });
-//      _ut.test('test_getPrefixes', () {
-//        final __test = new LibraryElementImplTest();
-//        runJUnitTest(__test, __test.test_getPrefixes);
-//      });
+      _ut.test('test_getPrefixes', () {
+        final __test = new LibraryElementImplTest();
+        runJUnitTest(__test, __test.test_getPrefixes);
+      });
       _ut.test('test_setImports', () {
         final __test = new LibraryElementImplTest();
         runJUnitTest(__test, __test.test_setImports);
@@ -1409,10 +1409,10 @@ class ElementImplTest extends EngineTestCase {
   }
   static dartSuite() {
     _ut.group('ElementImplTest', () {
-//      _ut.test('test_equals', () {
-//        final __test = new ElementImplTest();
-//        runJUnitTest(__test, __test.test_equals);
-//      });
+      _ut.test('test_equals', () {
+        final __test = new ElementImplTest();
+        runJUnitTest(__test, __test.test_equals);
+      });
       _ut.test('test_isAccessibleIn_private_differentLibrary', () {
         final __test = new ElementImplTest();
         runJUnitTest(__test, __test.test_isAccessibleIn_private_differentLibrary);