Prepare for decoupling analyzer ASTs from element model.

pkg/analyzer/test/generated/non_error_resolver_test.dart

Index: pkg/analyzer/test/generated/non_error_resolver_test.dart
diff --git a/pkg/analyzer/test/generated/non_error_resolver_test.dart b/pkg/analyzer/test/generated/non_error_resolver_test.dart
index 067627dbd9b4f1e6c36fe99a2b1bd08448ff893f..ac844283c9bb360fe2912a1fe34b96d90ad7e476 100644
--- a/pkg/analyzer/test/generated/non_error_resolver_test.dart
+++ b/pkg/analyzer/test/generated/non_error_resolver_test.dart
@@ -5,6 +5,7 @@
 library analyzer.test.generated.non_error_resolver_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/ast/resolution_accessors.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/error/codes.dart';
@@ -1038,7 +1039,7 @@ class E {}''');
     assertNoErrors(source);
     verify([source]);
     CompilationUnit unit = _getResolvedLibraryUnit(source);
-    ClassElement classC = unit.element.getType('C');
+    ClassElement classC = elementForCompilationUnit(unit).getType('C');
     expect(classC.documentationComment, isNotNull);
   }