Remove CanRetainOtherContext since embedded objects are now weak.

src/type-info.h

Index: src/type-info.h
diff --git a/src/type-info.h b/src/type-info.h
index 6866da2d1abb4eec433121777dec18cee63c859b..ea24aa82f83bb2bd294e5a3d27cd781a3b97e126 100644
--- a/src/type-info.h
+++ b/src/type-info.h
@@ -67,10 +67,6 @@ class TypeFeedbackOracle: public ZoneObject {
   template <class T>
   void CollectReceiverTypes(T* obj, SmallMapList* types);
 
-  static bool CanRetainOtherContext(Map* map, Context* native_context);
-  static bool CanRetainOtherContext(JSFunction* function,
-                                    Context* native_context);
-
   Handle<JSFunction> GetCallTarget(FeedbackVectorICSlot slot);
   Handle<AllocationSite> GetCallAllocationSite(FeedbackVectorICSlot slot);
   Handle<JSFunction> GetCallNewTarget(FeedbackVectorSlot slot);