Rename UNIT_TEST to WEBRTC_UNIT_TEST

Current name conflicts with upstream project code.

Bug: webrtc:12247
Change-Id: Ibd78273a75262772fc18fca688c29b9ba9525ce5
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/196653
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Andrey Logvin <landrey@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32813}
diff --git a/api/rtc_error.h b/api/rtc_error.h
index d24737c..7cfd89a 100644
--- a/api/rtc_error.h
+++ b/api/rtc_error.h
@@ -11,9 +11,9 @@
 #ifndef API_RTC_ERROR_H_
 #define API_RTC_ERROR_H_
 
-#ifdef UNIT_TEST
+#ifdef WEBRTC_UNIT_TEST
 #include <ostream>
-#endif  // UNIT_TEST
+#endif  // WEBRTC_UNIT_TEST
 #include <string>
 #include <utility>  // For std::move.
 
@@ -161,7 +161,7 @@
 RTC_EXPORT const char* ToString(RTCErrorType error);
 RTC_EXPORT const char* ToString(RTCErrorDetailType error);
 
-#ifdef UNIT_TEST
+#ifdef WEBRTC_UNIT_TEST
 inline std::ostream& operator<<(  // no-presubmit-check TODO(webrtc:8982)
     std::ostream& stream,         // no-presubmit-check TODO(webrtc:8982)
     RTCErrorType error) {
@@ -173,7 +173,7 @@
     RTCErrorDetailType error) {
   return stream << ToString(error);
 }
-#endif  // UNIT_TEST
+#endif  // WEBRTC_UNIT_TEST
 
 // Helper macro that can be used by implementations to create an error with a
 // message and log it. |message| should be a string literal or movable