Introduce "CommonElements"

pkg/compiler/lib/src/resolution/resolution.dart

Index: pkg/compiler/lib/src/resolution/resolution.dart
diff --git a/pkg/compiler/lib/src/resolution/resolution.dart b/pkg/compiler/lib/src/resolution/resolution.dart
index 73dd7fedc482cb43a4c6beb238665a7e98f88ee1..54e9603c944ca40a6d701ff1ed877348dc51ec10 100644
--- a/pkg/compiler/lib/src/resolution/resolution.dart
+++ b/pkg/compiler/lib/src/resolution/resolution.dart
@@ -19,7 +19,7 @@ import '../constants/expressions.dart'
         ConstructedConstantExpression,
         ErroneousConstantExpression;
 import '../constants/values.dart' show ConstantValue;
-import '../core_types.dart' show CoreClasses, CoreTypes;
+import '../core_types.dart' show CoreClasses, CoreTypes, CommonElements;
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../elements/modelx.dart'
@@ -76,6 +76,7 @@ class ResolverTask extends CompilerTask {
   Target get target => resolution.target;
   CoreTypes get coreTypes => resolution.coreTypes;
   CoreClasses get coreClasses => resolution.coreClasses;
+  CommonElements get commonElements => resolution.commonElements;
   ParsingContext get parsingContext => resolution.parsingContext;
   CompilerOptions get options => resolution.options;
   ResolutionEnqueuer get enqueuer => resolution.enqueuer;
@@ -634,7 +635,6 @@ class ResolverTask extends CompilerTask {
                     new ClassResolverVisitor(resolution, element, registry);
                 visitor.visit(tree);
                 element.resolutionState = STATE_DONE;
-                resolution.onClassResolved(element);
                 pendingClassesToBePostProcessed.add(element);
               }));
       if (element.isPatched) {