(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}
diff --git a/examples/peerconnection/client/conductor.cc b/examples/peerconnection/client/conductor.cc
index 096ff58..03f820a 100644
--- a/examples/peerconnection/client/conductor.cc
+++ b/examples/peerconnection/client/conductor.cc
@@ -25,7 +25,7 @@
 #include "api/audio_codecs/builtin_audio_encoder_factory.h"
 #include "api/audio_options.h"
 #include "api/create_peerconnection_factory.h"
-#include "api/rtpsenderinterface.h"
+#include "api/rtp_sender_interface.h"
 #include "api/video_codecs/builtin_video_decoder_factory.h"
 #include "api/video_codecs/builtin_video_encoder_factory.h"
 #include "api/video_codecs/video_decoder_factory.h"
@@ -36,12 +36,12 @@
 #include "modules/audio_processing/include/audio_processing.h"
 #include "modules/video_capture/video_capture.h"
 #include "modules/video_capture/video_capture_factory.h"
-#include "p2p/base/portallocator.h"
-#include "pc/videotracksource.h"
+#include "p2p/base/port_allocator.h"
+#include "pc/video_track_source.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/logging.h"
-#include "rtc_base/refcountedobject.h"
-#include "rtc_base/rtccertificategenerator.h"
+#include "rtc_base/ref_counted_object.h"
+#include "rtc_base/rtc_certificate_generator.h"
 #include "rtc_base/strings/json.h"
 #include "test/vcm_capturer.h"