Remove unnecessary includes of v8 headers from platform files

src/platform-win32.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 24 matching lines @@
 #include <_mingw.h>
 #ifdef MINGW_HAS_SECURE_API
 #undef MINGW_HAS_SECURE_API
 #endif  // MINGW_HAS_SECURE_API
 #endif  // __MINGW32__
 
 #include "win32-headers.h"
 
 #include "v8.h"
 
-#include "codegen.h"
 #include "isolate-inl.h"
 #include "platform.h"
-#include "simulator.h"
-#include "vm-state-inl.h"
 
 #ifdef _MSC_VER
 
 // Case-insensitive bounded string comparisons. Use stricmp() on Win32. Usually
 // defined in strings.h.
 int strncasecmp(const char* s1, const char* s2, int n) {
   return _strnicmp(s1, s2, n);
 }
 
 #endif  // _MSC_VER
@@ skipping 1453 matching lines @@
   ASSERT(result);
 }
 
 
 
 void Thread::YieldCPU() {
   Sleep(0);
 }
 
 } }  // namespace v8::internal