Merge CoreTypes and CoreClasses into CommonElements.

tests/compiler/dart2js/type_checker_test.dart

Index: tests/compiler/dart2js/type_checker_test.dart
diff --git a/tests/compiler/dart2js/type_checker_test.dart b/tests/compiler/dart2js/type_checker_test.dart
index 96dba28f247bd3a53b571c0563bac197cbd91be1..b0123f09f627a59fc31f2dd715e82ea2c08ff9dd 100644
--- a/tests/compiler/dart2js/type_checker_test.dart
+++ b/tests/compiler/dart2js/type_checker_test.dart
@@ -75,10 +75,10 @@ testSimpleTypes(MockCompiler compiler) {
     Expect.equals(type, analyzeType(compiler, code));
   }
 
-  checkType(compiler.coreTypes.intType, "3");
-  checkType(compiler.coreTypes.boolType, "false");
-  checkType(compiler.coreTypes.boolType, "true");
-  checkType(compiler.coreTypes.stringType, "'hestfisk'");
+  checkType(compiler.commonElements.intType, "3");
+  checkType(compiler.commonElements.boolType, "false");
+  checkType(compiler.commonElements.boolType, "true");
+  checkType(compiler.commonElements.stringType, "'hestfisk'");
 }
 
 Future testReturn(MockCompiler compiler) {