(4) Rename files to snake_case: update BUILD.gn, include paths, header guards, and DEPS entries

Mechanically generated by running this command:

tools_webrtc/do-renames.sh update all-renames.txt && git cl format

Then manually updating:

tools_webrtc/sanitizers/tsan_suppressions_webrtc.cc

Bug: webrtc:10159
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I54824cd91dada8fc3ee3d098f971bc319d477833
Reviewed-on: https://webrtc-review.googlesource.com/c/115653
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26226}

p2p/base/port.h

diff --git a/p2p/base/port.h b/p2p/base/port.h
index 5037377..cd8b737 100644
--- a/p2p/base/port.h
+++ b/p2p/base/port.h
@@ -19,24 +19,24 @@
 
 #include "absl/types/optional.h"
 #include "api/candidate.h"
-#include "api/rtcerror.h"
+#include "api/rtc_error.h"
 #include "logging/rtc_event_log/events/rtc_event_ice_candidate_pair.h"
 #include "logging/rtc_event_log/events/rtc_event_ice_candidate_pair_config.h"
-#include "logging/rtc_event_log/icelogger.h"
-#include "p2p/base/candidatepairinterface.h"
-#include "p2p/base/p2pconstants.h"
-#include "p2p/base/packetlossestimator.h"
-#include "p2p/base/packetsocketfactory.h"
-#include "p2p/base/portinterface.h"
+#include "logging/rtc_event_log/ice_logger.h"
+#include "p2p/base/candidate_pair_interface.h"
+#include "p2p/base/p2p_constants.h"
+#include "p2p/base/packet_loss_estimator.h"
+#include "p2p/base/packet_socket_factory.h"
+#include "p2p/base/port_interface.h"
 #include "p2p/base/stun.h"
-#include "p2p/base/stunrequest.h"
-#include "rtc_base/asyncpacketsocket.h"
+#include "p2p/base/stun_request.h"
+#include "rtc_base/async_packet_socket.h"
 #include "rtc_base/checks.h"
-#include "rtc_base/nethelper.h"
+#include "rtc_base/net_helper.h"
 #include "rtc_base/network.h"
-#include "rtc_base/proxyinfo.h"
-#include "rtc_base/ratetracker.h"
-#include "rtc_base/socketaddress.h"
+#include "rtc_base/proxy_info.h"
+#include "rtc_base/rate_tracker.h"
+#include "rtc_base/socket_address.h"
 #include "rtc_base/system/rtc_export.h"
 #include "rtc_base/third_party/sigslot/sigslot.h"
 #include "rtc_base/thread.h"