Fixed a long-standing TODO: Removed a few *-incl.h #includes from isolate.h.

src/isolate.h

 // Copyright 2011 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 1338 matching lines @@
 
 
 // Mark the global context with out of memory.
 inline void Context::mark_out_of_memory() {
   global_context()->set_out_of_memory(HEAP->true_value());
 }
 
 
 } }  // namespace v8::internal
 
-// TODO(isolates): Get rid of these -inl.h includes and place them only where
-//                 they're needed.
-#include "allocation-inl.h"
-#include "zone-inl.h"
-#include "frames-inl.h"
-
 #endif  // V8_ISOLATE_H_