Delete unneeded includes of async_invoker.h

Bug: None
Change-Id: I3753592f8eb53eb2b31cf645b80c446bd2251404
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133027
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27636}
diff --git a/pc/dtls_transport.h b/pc/dtls_transport.h
index 392532a..b5caae5 100644
--- a/pc/dtls_transport.h
+++ b/pc/dtls_transport.h
@@ -17,7 +17,6 @@
 #include "api/ice_transport_interface.h"
 #include "api/scoped_refptr.h"
 #include "p2p/base/dtls_transport.h"
-#include "rtc_base/async_invoker.h"
 
 namespace webrtc {
 
diff --git a/sdk/objc/native/src/audio/audio_session_observer.h b/sdk/objc/native/src/audio/audio_session_observer.h
index 27b1b38..f7c44c8 100644
--- a/sdk/objc/native/src/audio/audio_session_observer.h
+++ b/sdk/objc/native/src/audio/audio_session_observer.h
@@ -11,7 +11,6 @@
 #ifndef SDK_OBJC_NATIVE_SRC_AUDIO_AUDIO_SESSION_OBSERVER_H_
 #define SDK_OBJC_NATIVE_SRC_AUDIO_AUDIO_SESSION_OBSERVER_H_
 
-#include "rtc_base/async_invoker.h"
 #include "rtc_base/thread.h"
 
 namespace webrtc {