Try to make a NOTREACHED definition suitable for win8.

third_party/base/logging.h

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PDFIUM_THIRD_PARTY_BASE_LOGGING_H_
 #define PDFIUM_THIRD_PARTY_BASE_LOGGING_H_
 
+#include <assert.h>
 #include <stdlib.h>
 
 #define CHECK(condition)                                                \
   if (!(condition)) {                                                   \
     abort();                                                            \
     *(reinterpret_cast<volatile char*>(NULL) + 42) = 0x42;              \
   }
 
-#define NOTREACHED() abort()
+#define NOTREACHED() assert(false)
 
 #endif  // PDFIUM_THIRD_PARTY_BASE_LOGGING_H_