Remove obsolete global SubString method.

src/objects.cc

 // Copyright 2013 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 9716 matching lines @@
 
 bool SharedFunctionInfo::HasSourceCode() {
   return !script()->IsUndefined() &&
          !reinterpret_cast<Script*>(script())->source()->IsUndefined();
 }
 
 
 Handle<Object> SharedFunctionInfo::GetSourceCode() {
   if (!HasSourceCode()) return GetIsolate()->factory()->undefined_value();
   Handle<String> source(String::cast(Script::cast(script())->source()));
-  return SubString(source, start_position(), end_position());
+  return GetIsolate()->factory()->NewSubString(
+      source, start_position(), end_position());
 }
 
 
 int SharedFunctionInfo::SourceSize() {
   return end_position() - start_position();
 }
 
 
 int SharedFunctionInfo::CalculateInstanceSize() {
   int instance_size =
@@ skipping 6357 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal