WTF: Remove NO_RETURN, NO_RETURN_DUE_TO_CRASH, and NO_RETURN_DUE_TO_ASSERT.

third_party/WebKit/Source/wtf/Compiler.h

 /*
  * Copyright (C) 2011, 2012 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 43 matching lines @@
 #define GCC_VERSION_AT_LEAST(major, minor, patch) \
   (GCC_VERSION >= (major * 10000 + minor * 100 + patch))
 #else
 /* Define this for !GCC compilers, just so we can write things like
  * GCC_VERSION_AT_LEAST(4, 1, 0). */
 #define GCC_VERSION_AT_LEAST(major, minor, patch) 0
 #endif
 
 /* ==== Compiler features ==== */
 
-/* NO_RETURN */
-
-#ifndef NO_RETURN

[Yuta Kitamura, 2016/11/21 08:55:21]

I was initially a bit hesitant to remove this, because noreturn has some
performance benefits (compilers are able to skip saving the register
values, etc.).

However, I start to think it's okay to remove this and the use sites in
Blink for now, because:
(1) C++11 has a standard way of writing this: [[noreturn]]
    http://en.cppreference.com/w/cpp/language/attributes
(2) All the use sites do not seem performance sensitive.

-#if COMPILER(GCC)
-#define NO_RETURN __attribute((__noreturn__))
-#elif COMPILER(MSVC)
-#define NO_RETURN __declspec(noreturn)
-#else
-#define NO_RETURN
-#endif
-#endif
-
 /* NEVER_INLINE */
 
 // TODO(palmer): Remove this and update callers to use NOINLINE from Chromium
 // base. https://bugs.chromium.org/p/chromium/issues/detail?id=632441
 //
 // For compatibility with callers in Blink:
 #define NEVER_INLINE NOINLINE
 
 /* WARN_UNUSED_RETURN */
 
@@ skipping 40 matching lines @@
 /* WTF_NON_EXPORTED_BASE; similar NON_EXPORTED_BASE in base/compiler_specific.h
  */
 
 #if COMPILER(MSVC)
 #define WTF_NON_EXPORTED_BASE(code) __pragma(warning(suppress : 4275)) code
 #else
 #define WTF_NON_EXPORTED_BASE(code) code
 #endif
 
 #endif /* WTF_Compiler_h */