Stack traces exposed to Javascript should omit extensions.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include "src/allocation.h"
 #include "src/assert-scope.h"
 #include "src/builtins.h"
@@ skipping 7616 matching lines @@
   // 8.6.2, page 27.
   inline Code* code();
   inline void set_code(Code* code);
   inline void set_code_no_write_barrier(Code* code);
   inline void ReplaceCode(Code* code);
 
   // Tells whether this function is builtin.
   inline bool IsBuiltin();
 
   // Tells whether this function is defined in a native script.
-  inline bool IsNative();
+  inline bool IsFromNativeScript();
+
+  // Tells whether this function is defined in an extension script.
+  inline bool IsFromExtensionScript();
 
   // Tells whether or not the function needs arguments adaption.
   inline bool NeedsArgumentsAdaption();
 
   // Tells whether or not this function has been optimized.
   inline bool IsOptimized();
 
   // Tells whether or not this function can be optimized.
   inline bool IsOptimizable();
 
@@ skipping 3548 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_