Remove some dead code.

src/isolate.cc

 // Copyright 2012 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 408 matching lines @@
 }
 
 
 char* Isolate::Iterate(ObjectVisitor* v, char* thread_storage) {
   ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(thread_storage);
   Iterate(v, thread);
   return thread_storage + sizeof(ThreadLocalTop);
 }
 
 
-void Isolate::IterateThread(ThreadVisitor* v) {
-  v->VisitThread(this, thread_local_top());
-}
-
-
 void Isolate::IterateThread(ThreadVisitor* v, char* t) {
   ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(t);
   v->VisitThread(this, thread);
 }
 
 
 void Isolate::Iterate(ObjectVisitor* v, ThreadLocalTop* thread) {
   // Visit the roots from the top for a given thread.
   Object* pending;
   // The pending exception can sometimes be a failure.  We can't show
@@ skipping 1734 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal