Try to make a NOTREACHED definition suitable for win8.

third_party/base/logging.h

Index: third_party/base/logging.h
diff --git a/third_party/base/logging.h b/third_party/base/logging.h
index d24f93b2a12f46b6c3ec448ae5f91ac2552641bb..98ed9c5da0059d40ccd26d82fd2a0468053da4c9 100644
--- a/third_party/base/logging.h
+++ b/third_party/base/logging.h
@@ -5,6 +5,7 @@
 #ifndef PDFIUM_THIRD_PARTY_BASE_LOGGING_H_
 #define PDFIUM_THIRD_PARTY_BASE_LOGGING_H_
 
+#include <assert.h>
 #include <stdlib.h>
 
 #define CHECK(condition)                                                \
@@ -13,6 +14,6 @@
     *(reinterpret_cast<volatile char*>(NULL) + 42) = 0x42;              \
   }
 
-#define NOTREACHED() abort()
+#define NOTREACHED() assert(false)
 
 #endif  // PDFIUM_THIRD_PARTY_BASE_LOGGING_H_