Remove //rtc_base:safe_conversions from public deps

Bug: webrtc:8603
Change-Id: I285ac30975039f8fe9882d1673cc8e4a615c8618
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/257912
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Auto-Submit: Florent Castelli <orphis@webrtc.org>
Commit-Queue: Florent Castelli <orphis@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36452}
diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index 058e1ea..d0551b7 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -88,6 +88,7 @@
     ":rtc_event",
     ":rtc_task_queue",
     ":safe_compare",
+    ":safe_conversions",
     ":type_traits",
     "../api:array_view",
     "../api:scoped_refptr",
@@ -179,7 +180,6 @@
   public_deps += [  # no-presubmit-check TODO(webrtc:8603)
     ":platform_thread",
     ":platform_thread_types",
-    ":safe_conversions",
     ":stringutils",
     ":timeutils",
     "../api:sequence_checker",
@@ -943,6 +943,7 @@
     ":refcount",
     ":rtc_event",
     ":rtc_task_queue",
+    ":safe_conversions",
     ":socket",
     ":socket_address",
     ":socket_factory",
@@ -1562,6 +1563,7 @@
         ":refcount",
         ":rtc_base_tests_utils",
         ":rtc_event",
+        ":safe_conversions",
         ":socket",
         ":socket_address",
         ":socket_factory",