Merge CoreTypes and CoreClasses into CommonElements.

pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart b/pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart
index 57e10a27476da1f9ba1acc929d562460215bdb17..9f67aa99fb23f4e31ac0bed624fd2fe9f355de09 100644
--- a/pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart
@@ -1140,17 +1140,17 @@ class FragmentEmitter {
   js.Property emitMangledGlobalNames() {
     List<js.Property> names = <js.Property>[];
 
-    CoreClasses coreClasses = compiler.coreClasses;
+    CommonElements commonElements = compiler.commonElements;
     // We want to keep the original names for the most common core classes when
     // calling toString on them.
     List<ClassElement> nativeClassesNeedingUnmangledName = [
-      coreClasses.intClass,
-      coreClasses.doubleClass,
-      coreClasses.numClass,
-      coreClasses.stringClass,
-      coreClasses.boolClass,
-      coreClasses.nullClass,
-      coreClasses.listClass
+      commonElements.intClass,
+      commonElements.doubleClass,
+      commonElements.numClass,
+      commonElements.stringClass,
+      commonElements.boolClass,
+      commonElements.nullClass,
+      commonElements.listClass
     ];
     // TODO(floitsch): this should probably be on a per-fragment basis.
     nativeClassesNeedingUnmangledName.forEach((element) {