Merge CoreTypes and CoreClasses into CommonElements.

tests/compiler/dart2js/mirrors_used_test.dart

Index: tests/compiler/dart2js/mirrors_used_test.dart
diff --git a/tests/compiler/dart2js/mirrors_used_test.dart b/tests/compiler/dart2js/mirrors_used_test.dart
index 9282b16e0e8fe294f59047ac8c0f96a528d1cd7a..f22924512d6b973fb98584e59268bb26c790f334 100644
--- a/tests/compiler/dart2js/mirrors_used_test.dart
+++ b/tests/compiler/dart2js/mirrors_used_test.dart
@@ -84,13 +84,13 @@ void main() {
 
     // We always include the names of some native classes.
     List<Element> nativeClasses = [
-      compiler.coreClasses.intClass,
-      compiler.coreClasses.doubleClass,
-      compiler.coreClasses.numClass,
-      compiler.coreClasses.stringClass,
-      compiler.coreClasses.boolClass,
-      compiler.coreClasses.nullClass,
-      compiler.coreClasses.listClass
+      compiler.commonElements.intClass,
+      compiler.commonElements.doubleClass,
+      compiler.commonElements.numClass,
+      compiler.commonElements.stringClass,
+      compiler.commonElements.boolClass,
+      compiler.commonElements.nullClass,
+      compiler.commonElements.listClass
     ];
     JavaScriptBackend backend = compiler.backend;
     Iterable<String> nativeNames = nativeClasses.map(backend.namer.className);