- Properly load the core libraries as libraries and not as scripts.

runtime/vm/parser.h

Index: runtime/vm/parser.h
===================================================================
--- runtime/vm/parser.h	(revision 18894)
+++ runtime/vm/parser.h	(working copy)
@@ -336,9 +336,9 @@
   void ParseTopLevelAccessor(TopLevel* top_level);
 
   // Support for parsing libraries.
-  Dart_Handle CallLibraryTagHandler(Dart_LibraryTag tag,
-                                    intptr_t token_pos,
-                                    const String& url);
+  RawObject* CallLibraryTagHandler(Dart_LibraryTag tag,
+                                   intptr_t token_pos,
+                                   const String& url);
   void ParseIdentList(GrowableObjectArray* names);
   void ParseLibraryDefinition();
   void ParseLibraryName();