Delete RTC_WARN_UNUSED_RESULT as no longer used
All usage was replaced with ABSL_MUST_USE_RESULT
Bug: webrtc:12336
Change-Id: Ic69a8815f0a32f92231f619d4826a6fcbf76120b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/202035
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33020}
diff --git a/rtc_base/system/unused.h b/rtc_base/system/unused.h
index a0add4e..084c526 100644
--- a/rtc_base/system/unused.h
+++ b/rtc_base/system/unused.h
@@ -11,21 +11,6 @@
#ifndef RTC_BASE_SYSTEM_UNUSED_H_
#define RTC_BASE_SYSTEM_UNUSED_H_
-// Annotate a function indicating the caller must examine the return value.
-// Use like:
-// int foo() RTC_WARN_UNUSED_RESULT;
-// To explicitly ignore a result, cast to void.
-// TODO(kwiberg): Remove when we can use [[nodiscard]] from C++17.
-#if defined(__clang__)
-#define RTC_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
-#elif defined(__GNUC__)
-// gcc has a __warn_unused_result__ attribute, but you can't quiet it by
-// casting to void, so we don't use it.
-#define RTC_WARN_UNUSED_RESULT
-#else
-#define RTC_WARN_UNUSED_RESULT
-#endif
-
// Prevent the compiler from warning about an unused variable. For example:
// int result = DoSomething();
// assert(result == 17);
