Fixes bug 1426704....

src/runtime.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 873 matching lines @@
     SetExpectedNofProperties(target, fun->shared()->expected_nof_properties());
     if (!fun->is_compiled() && !CompileLazy(fun, KEEP_EXCEPTION)) {
       return Failure::Exception();
     }
     // Set the code, formal parameter count, and the length of the target
     // function.
     target->set_code(fun->code());
     target->shared()->set_length(fun->shared()->length());
     target->shared()->set_formal_parameter_count(
         fun->shared()->formal_parameter_count());
-    // Set the source code of the target function.
-    target->shared()->set_script(fun->shared()->script());
-    target->shared()->set_start_position(fun->shared()->start_position());
-    target->shared()->set_end_position(fun->shared()->end_position());
+    // Set the source code of the target function to undefined.
+    // SetCode is only used for built-in constructors like String,
+    // Array, and Object, and some web code
+    // doesn't like seeing source code for constructors.
+    target->shared()->set_script(Heap::undefined_value());
     context = Handle<Context>(fun->context());
 
     // Make sure we get a fresh copy of the literal vector to avoid
     // cross context contamination.
     int number_of_literals = fun->NumberOfLiterals();
     Handle<FixedArray> literals =
         Factory::NewFixedArray(number_of_literals, TENURED);
     if (number_of_literals > 0) {
       // Insert the object, regexp and array functions in the literals
       // array prefix.  These are the functions that will be used when
@@ skipping 4422 matching lines @@
 
 void Runtime::PerformGC(Object* result) {
   Failure* failure = Failure::cast(result);
   // Try to do a garbage collection; ignore it if it fails. The C
   // entry stub will throw an out-of-memory exception in that case.
   Heap::CollectGarbage(failure->requested(), failure->allocation_space());
 }
 
 
 } }  // namespace v8::internal