Remove V8_WARN_UNUSED_RESULT for simple getters.

src/platform/condition-variable.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 87 matching lines @@
 
    private:
     Event* waitlist_;
     Event* freelist_;
     Mutex mutex_;
 
     DISALLOW_COPY_AND_ASSIGN(NativeHandle);
   };
 #endif
 
-  NativeHandle& native_handle() V8_WARN_UNUSED_RESULT {
+  NativeHandle& native_handle() {
     return native_handle_;
   }
-  const NativeHandle& native_handle() const V8_WARN_UNUSED_RESULT {
+  const NativeHandle& native_handle() const {
     return native_handle_;
   }
 
  private:
   NativeHandle native_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(ConditionVariable);
 };
 
 
 // POD ConditionVariable initialized lazily (i.e. the first time Pointer() is
 // called).
 // Usage:
 //   static LazyConditionVariable my_condvar =
 //       LAZY_CONDITION_VARIABLE_INITIALIZER;
 //
 //   void my_function() {
 //     LockGuard<Mutex> lock_guard(&my_mutex);
 //     my_condvar.Pointer()->Wait(&my_mutex);
 //   }
 typedef LazyStaticInstance<ConditionVariable,
                            DefaultConstructTrait<ConditionVariable>,
                            ThreadSafeInitOnceTrait>::type LazyConditionVariable;
 
 #define LAZY_CONDITION_VARIABLE_INITIALIZER LAZY_STATIC_INSTANCE_INITIALIZER
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_CONDITION_VARIABLE_H_