Running apply-iwyu on ~all files in pc/

Bug: none
Change-Id: Ieebdfb743e691f7ae35e1aa354f68ce9e771064d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/204381
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33105}
diff --git a/pc/webrtc_sdp.h b/pc/webrtc_sdp.h
index 588e02f..aa3317f 100644
--- a/pc/webrtc_sdp.h
+++ b/pc/webrtc_sdp.h
@@ -22,7 +22,12 @@
 
 #include <string>
 
+#include "api/candidate.h"
+#include "api/jsep.h"
+#include "api/jsep_ice_candidate.h"
+#include "api/jsep_session_description.h"
 #include "media/base/codec.h"
+#include "rtc_base/strings/string_builder.h"
 #include "rtc_base/system/rtc_export.h"
 
 namespace cricket {