Redo how Type objects are exposed from DDC.

lib/runtime/dart_library.js

Index: lib/runtime/dart_library.js
diff --git a/lib/runtime/dart_library.js b/lib/runtime/dart_library.js
index 5f47c853784ff91d62755169320a5d41502c9858..1f0eb834d8ce1af62fa117fddacd4588de5e2c68 100644
--- a/lib/runtime/dart_library.js
+++ b/lib/runtime/dart_library.js
@@ -107,15 +107,6 @@ var dart_library =
 
     // Force import of core.
     var dart_sdk = import_('dart_sdk');
-    var core = dart_sdk.core;
-
-    // TODO(jmesserly): this can't be right.
-    // See: https://github.com/dart-lang/dev_compiler/issues/488
-    core.Object.toString = function() {
-      // Interface types are represented by the corresponding constructor
-      // function.  This ensures that Dart interface types print properly.
-      return this.name;
-    }
 
     // TODO(vsm): DOM facades?
     // See: https://github.com/dart-lang/dev_compiler/issues/173