Delete unneeded includes of string_utils.h

Bug: None
Change-Id: I3618903ebd6d6888c2a9548dc97761d0d2e74d0a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/140040
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28207}
diff --git a/api/media_transport_config.cc b/api/media_transport_config.cc
index 99c4140..08a8756 100644
--- a/api/media_transport_config.cc
+++ b/api/media_transport_config.cc
@@ -11,7 +11,6 @@
 #include "api/media_transport_config.h"
 
 #include "rtc_base/checks.h"
-#include "rtc_base/string_utils.h"
 #include "rtc_base/strings/string_builder.h"
 
 namespace webrtc {
diff --git a/rtc_base/strings/string_builder.h b/rtc_base/strings/string_builder.h
index 918271b..e528cf2 100644
--- a/rtc_base/strings/string_builder.h
+++ b/rtc_base/strings/string_builder.h
@@ -18,9 +18,6 @@
 #include "absl/strings/string_view.h"
 #include "api/array_view.h"
 #include "rtc_base/string_encode.h"
-// TODO(nisse): Delete, as as soon as downstream applications are updated to not
-// rely in this indirect include.
-#include "rtc_base/string_utils.h"
 
 namespace rtc {