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}

pc/ice_server_parsing.cc

@@ -12,7 +12,9 @@
 
 #include <stddef.h>
 
+#include <algorithm>
 #include <cctype>  // For std::isdigit.
+#include <memory>
 #include <string>
 
 #include "p2p/base/port_interface.h"
@@ -21,6 +23,7 @@
 #include "rtc_base/ip_address.h"
 #include "rtc_base/logging.h"
 #include "rtc_base/socket_address.h"
+#include "rtc_base/string_encode.h"
 
 namespace webrtc {