[Cleanup] Add missing #include. Remove useless ones. IWYU part 2.

This is a follow-up to
https://webrtc-review.googlesource.com/c/src/+/106280.
This time the whole code base is covered.
Some files may have not been fixed though, whenever the IWYU tool
was breaking the build.

Bug: webrtc:8311
Change-Id: I2c31f552a87e887d33931d46e87b6208b1e483ef
Reviewed-on: https://webrtc-review.googlesource.com/c/111965
Commit-Queue: Yves Gerey <yvesg@google.com>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25830}
diff --git a/pc/localaudiosource.h b/pc/localaudiosource.h
index c48f540..dfd72e0 100644
--- a/pc/localaudiosource.h
+++ b/pc/localaudiosource.h
@@ -11,9 +11,10 @@
 #ifndef PC_LOCALAUDIOSOURCE_H_
 #define PC_LOCALAUDIOSOURCE_H_
 
+#include "api/audio_options.h"
 #include "api/mediastreaminterface.h"
 #include "api/notifier.h"
-#include "media/base/mediachannel.h"
+#include "rtc_base/scoped_ref_ptr.h"
 
 // LocalAudioSource implements AudioSourceInterface.
 // This contains settings for switching audio processing on and off.