Replace linked list of loaded libraries

runtime/vm/object_store.h

Index: runtime/vm/object_store.h
===================================================================
--- runtime/vm/object_store.h	(revision 7922)
+++ runtime/vm/object_store.h	(working copy)
@@ -443,17 +443,16 @@
     root_library_ = value.raw();
   }
 
+  RawGrowableObjectArray* libraries() const { return libraries_; }
+  void set_libraries(const GrowableObjectArray& value) {
+    libraries_ = value.raw();
+  }
+
   RawArray* import_map() const { return import_map_; }
   void set_import_map(const Array& value) {
     import_map_ = value.raw();
   }
 
-  // Returns head of list of registered libraries.
-  RawLibrary* registered_libraries() const { return registered_libraries_; }
-  void set_registered_libraries(const Library& value) {
-    registered_libraries_ = value.raw();
-  }
-
   RawGrowableObjectArray* pending_classes() const { return pending_classes_; }
   void set_pending_classes(const GrowableObjectArray& value) {
     ASSERT(!value.IsNull());
@@ -578,8 +577,8 @@
   RawLibrary* native_wrappers_library_;
   RawLibrary* builtin_library_;
   RawLibrary* root_library_;
+  RawGrowableObjectArray* libraries_;
   RawArray* import_map_;
-  RawLibrary* registered_libraries_;
   RawGrowableObjectArray* pending_classes_;
   RawError* sticky_error_;
   RawContext* empty_context_;