Use Chrome compatible naming for compiler specifics.

include/v8config.h

 // Copyright 2013 the V8 project 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 V8CONFIG_H_
 #define V8CONFIG_H_
 
 // Platform headers for feature detection below.
 #if defined(__ANDROID__)
 # include <sys/cdefs.h>
@@ skipping 312 matching lines @@
 #elif defined(V8_DEPRECATION_WARNINGS) && V8_HAS_ATTRIBUTE_DEPRECATED
 # define V8_DEPRECATED(message, declarator) \
 declarator __attribute__((deprecated))
 #elif defined(V8_DEPRECATION_WARNINGS) && V8_HAS_DECLSPEC_DEPRECATED
 # define V8_DEPRECATED(message, declarator) __declspec(deprecated) declarator
 #else
 # define V8_DEPRECATED(message, declarator) declarator
 #endif
 
 
-// A macro to mark variables or types as unused, avoiding compiler warnings.
-#if V8_HAS_ATTRIBUTE_UNUSED
-# define V8_UNUSED __attribute__((unused))
-#else
-# define V8_UNUSED
-#endif
-
-
-// Annotate a function indicating the caller must examine the return value.
-// Use like:
-//   int foo() V8_WARN_UNUSED_RESULT;
-#if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT
-# define V8_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
-#else
-# define V8_WARN_UNUSED_RESULT /* NOT SUPPORTED */
-#endif
-
-
 // A macro to provide the compiler with branch prediction information.
 #if V8_HAS_BUILTIN_EXPECT
 # define V8_UNLIKELY(condition) (__builtin_expect(!!(condition), 0))
 # define V8_LIKELY(condition) (__builtin_expect(!!(condition), 1))
 #else
 # define V8_UNLIKELY(condition) (condition)
 # define V8_LIKELY(condition) (condition)
 #endif
 
 
@@ skipping 10 matching lines @@
 //     A(const A& other) V8_DELETE;
 //     A& operator=(const A& other) V8_DELETE;
 //   };
 #if V8_HAS_CXX11_DELETE
 # define V8_DELETE = delete
 #else
 # define V8_DELETE /* NOT SUPPORTED */
 #endif
 
 
-// Annotate a virtual method indicating it must be overriding a virtual
-// method in the parent class.
-// Use like:
-//   virtual void bar() V8_OVERRIDE;
-#if V8_HAS_CXX11_OVERRIDE
-# define V8_OVERRIDE override
-#else
-# define V8_OVERRIDE /* NOT SUPPORTED */
-#endif
-
-
-// Annotate a virtual method indicating that subclasses must not override it,
-// or annotate a class to indicate that it cannot be subclassed.
-// Use like:
-//   class B V8_FINAL : public A {};
-//   virtual void bar() V8_FINAL;
-#if V8_HAS_CXX11_FINAL
-# define V8_FINAL final
-#elif V8_HAS___FINAL
-# define V8_FINAL __final
-#elif V8_HAS_SEALED
-# define V8_FINAL sealed
-#else
-# define V8_FINAL /* NOT SUPPORTED */
-#endif
-
-
 // This macro allows to specify memory alignment for structs, classes, etc.
 // Use like:
 //   class V8_ALIGNED(16) MyClass { ... };
 //   V8_ALIGNED(32) int array[42];
 #if V8_HAS_CXX11_ALIGNAS
 # define V8_ALIGNED(n) alignas(n)
 #elif V8_HAS_ATTRIBUTE_ALIGNED
 # define V8_ALIGNED(n) __attribute__((aligned(n)))
 #elif V8_HAS_DECLSPEC_ALIGN
 # define V8_ALIGNED(n) __declspec(align(n))
@@ skipping 33 matching lines @@
 # define V8_ALIGNOF(type) __alignof__(type)
 #else
 // Note that alignment of a type within a struct can be less than the
 // alignment of the type stand-alone (because of ancient ABIs), so this
 // should only be used as a last resort.
 namespace v8 { template <typename T> class AlignOfHelper { char c; T t; }; }
 # define V8_ALIGNOF(type) (sizeof(::v8::AlignOfHelper<type>) - sizeof(type))
 #endif
 
 #endif  // V8CONFIG_H_