Removing -Wno-tautological-compare.

Bug: webrtc:9251
Change-Id: I092fbb596dc67f7a381182e734d68709c730c5c0
Reviewed-on: https://webrtc-review.googlesource.com/75501
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23185}
diff --git a/modules/audio_device/BUILD.gn b/modules/audio_device/BUILD.gn
index d7a8f5a..9e591fa 100644
--- a/modules/audio_device/BUILD.gn
+++ b/modules/audio_device/BUILD.gn
@@ -34,7 +34,6 @@
       "-Wno-parentheses-equality",
       "-Wno-reorder",
       "-Wno-shift-overflow",
-      "-Wno-tautological-compare",
 
       # See https://bugs.chromium.org/p/webrtc/issues/detail?id=6265
       # for -Wno-thread-safety-analysis