Refactoring InterfaceDescriptors away from code-stubs.h

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 11320d6f04a328037dd00acb7f75b5d485d80be5..0437f32b9907c13bdf4e08b00fca59a398b0e817 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -1022,16 +1022,7 @@ class Isolate {
   CodeStubInterfaceDescriptor*
       code_stub_interface_descriptor(int index);
 
-  enum CallDescriptorKey {
-    KeyedCall,
-    NamedCall,
-    CallHandler,
-    ArgumentAdaptorCall,
-    ApiFunctionCall,
-    NUMBER_OF_CALL_DESCRIPTORS
-  };
-
-  CallInterfaceDescriptor* call_descriptor(CallDescriptorKey index);
+  CallInterfaceDescriptor* call_descriptor(int index);
 
   void IterateDeferredHandles(ObjectVisitor* visitor);
   void LinkDeferredHandles(DeferredHandles* deferred_handles);