Deprecating ThreadChecker specific interface.

All changes outside thread_checker.h are by:
s/CalledOnValidThread/IsCurrent/
s/DetachFromThread/Detach/

Bug: webrtc:9883
Change-Id: Idbb1086bff0817db58e770116acf4c9d60fae8b3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/131023
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27494}
diff --git a/examples/objcnativeapi/objc/objc_call_client.mm b/examples/objcnativeapi/objc/objc_call_client.mm
index a30f7f6..cbe2bab 100644
--- a/examples/objcnativeapi/objc/objc_call_client.mm
+++ b/examples/objcnativeapi/objc/objc_call_client.mm
@@ -60,7 +60,7 @@
 
 ObjCCallClient::ObjCCallClient()
     : call_started_(false), pc_observer_(absl::make_unique<PCObserver>(this)) {
-  thread_checker_.DetachFromThread();
+  thread_checker_.Detach();
   CreatePeerConnectionFactory();
 }