Fix windows build failures

runtime/vm/os_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "vm/os.h"
 
 #include <malloc.h>  // NOLINT
 #include <process.h>  // NOLINT
 #include <time.h>  // NOLINT
 
 #include "platform/utils.h"
 #include "platform/assert.h"
 #include "vm/os_thread.h"
-#include "vm/vtune.h"
 #include "vm/zone.h"
 
 namespace dart {
 
 // Defined in vm/os_thread_win.cc
 extern bool private_flag_windows_run_tls_destructors;
 
 const char* OS::Name() {
   return "windows";
 }
@@ skipping 330 matching lines @@
       (str[i + 2] != '\0')) {
     base = 16;
   }
   errno = 0;
   *value = _strtoi64(str, &endptr, base);
   return ((errno == 0) && (endptr != str) && (*endptr == 0));
 }
 
 
 void OS::RegisterCodeObservers() {
-#if defined(DART_VTUNE_SUPPORT)
-  CodeObservers::Register(new VTuneCodeObserver);
-#endif
 }
 
 
 void OS::PrintErr(const char* format, ...) {
   va_list args;
   va_start(args, format);
   VFPrint(stderr, format, args);
   va_end(args);
 }
 
@@ skipping 36 matching lines @@
   // TODO(zra): Remove once VM shuts down cleanly.
   private_flag_windows_run_tls_destructors = false;
   // On Windows we use ExitProcess so that threads can't clobber the exit_code.
   // See: https://code.google.com/p/nativeclient/issues/detail?id=2870
   ::ExitProcess(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)