Various clean-ups after top-level lexical declarations are done.

src/interface.h

Index: src/interface.h
diff --git a/src/interface.h b/src/interface.h
index 19f89ce9a75827bda74c109c80fe51958eca33ed..1843f47846b4f8f5c943c7a584fa2b554b3c7cee 100644
--- a/src/interface.h
+++ b/src/interface.h
@@ -123,7 +123,7 @@ class Interface : public ZoneObject {
     return exports ? exports->occupancy() : 0;
   }
 
-  // The context slot in the hosting global context pointing to this module.
+  // The context slot in the hosting script context pointing to this module.
   int Index() {
     DCHECK(IsModule() && IsFrozen());
     return Chase()->index_;