Use LOG() or LOG_IF() instead of IMMEDIATE_CRASH

third_party/WebKit/Source/platform/wtf/Assertions.h

 /*
  * Copyright (C) 2003, 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 111 matching lines @@
 #endif
 
 // SECURITY_DCHECK and SECURITY_CHECK
 // Use in places where failure of the assertion indicates a possible security
 // vulnerability. Classes of these vulnerabilities include bad casts, out of
 // bounds accesses, use-after-frees, etc. Please be sure to file bugs for these
 // failures using the security template:
 //    https://bugs.chromium.org/p/chromium/issues/entry?template=Security%20Bug
 #if ENABLE_SECURITY_ASSERT
 #define SECURITY_DCHECK(condition) \
-  LOG_IF(FATAL, !(condition)) << "Security DCHECK failed: " #condition ". "
+  CHECK(condition) << "Security DCHECK failed: " #condition ". "

[tkent, 2017/06/05 01:58:51]

Do not replace this.  LOG_IF and CHECK produce difference messages, and I think
ClusterFuzz replies on the message.

[gyuyoung, 2017/06/05 02:32:29]

Do you mean that LOG_IF() should be kept ?

[tkent, 2017/06/05 02:34:55]

Yes.

 // A SECURITY_CHECK failure is actually not vulnerable.
 #define SECURITY_CHECK(condition) \
-  LOG_IF(FATAL, !(condition)) << "Security CHECK failed: " #condition ". "
+  CHECK(condition) << "Security CHECK failed: " #condition ". "

[tkent, 2017/06/05 01:58:51]

Ditto.

 #else
 #define SECURITY_DCHECK(condition) ((void)0)
 #define SECURITY_CHECK(condition) CHECK(condition)
 #endif
 
 // DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES
 // Allow equality comparisons of Objects by reference or pointer,
 // interchangeably.  This can be only used on types whose equality makes no
 // other sense than pointer equality.
 #define DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES(thisType)    \
@@ skipping 59 matching lines @@
     return static_cast<thisType&>(argument);                                  \
   }                                                                           \
   inline const thisType& To##thisType##OrDie(const argumentType& argument) {  \
     CHECK(referencePredicate);                                                \
     return static_cast<const thisType&>(argument);                            \
   }                                                                           \
   void To##thisType##OrDie(const thisType*);                                  \
   void To##thisType##OrDie(const thisType&)
 
 #endif  // WTF_Assertions_h