(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}

pc/rtp_sender_receiver_unittest.cc

diff --git a/pc/rtp_sender_receiver_unittest.cc b/pc/rtp_sender_receiver_unittest.cc
index ec1e949..5672a9c 100644
--- a/pc/rtp_sender_receiver_unittest.cc
+++ b/pc/rtp_sender_receiver_unittest.cc
@@ -18,39 +18,39 @@
 #include "absl/memory/memory.h"
 #include "absl/types/optional.h"
 #include "api/audio_options.h"
-#include "api/crypto/cryptooptions.h"
-#include "api/crypto/framedecryptorinterface.h"
-#include "api/crypto/frameencryptorinterface.h"
-#include "api/dtmfsenderinterface.h"
-#include "api/mediastreaminterface.h"
-#include "api/rtcerror.h"
-#include "api/rtpparameters.h"
+#include "api/crypto/crypto_options.h"
+#include "api/crypto/frame_decryptor_interface.h"
+#include "api/crypto/frame_encryptor_interface.h"
+#include "api/dtmf_sender_interface.h"
+#include "api/media_stream_interface.h"
+#include "api/rtc_error.h"
+#include "api/rtp_parameters.h"
 #include "api/test/fake_frame_decryptor.h"
 #include "api/test/fake_frame_encryptor.h"
 #include "logging/rtc_event_log/rtc_event_log.h"
 #include "media/base/codec.h"
-#include "media/base/fakemediaengine.h"
-#include "media/base/mediachannel.h"
-#include "media/base/mediaconfig.h"
-#include "media/base/mediaengine.h"
-#include "media/base/rtpdataengine.h"
-#include "media/base/streamparams.h"
-#include "media/base/testutils.h"
-#include "media/engine/fakewebrtccall.h"
-#include "p2p/base/dtlstransportinternal.h"
-#include "p2p/base/fakedtlstransport.h"
-#include "p2p/base/p2pconstants.h"
-#include "pc/audiotrack.h"
+#include "media/base/fake_media_engine.h"
+#include "media/base/media_channel.h"
+#include "media/base/media_config.h"
+#include "media/base/media_engine.h"
+#include "media/base/rtp_data_engine.h"
+#include "media/base/stream_params.h"
+#include "media/base/test_utils.h"
+#include "media/engine/fake_webrtc_call.h"
+#include "p2p/base/dtls_transport_internal.h"
+#include "p2p/base/fake_dtls_transport.h"
+#include "p2p/base/p2p_constants.h"
+#include "pc/audio_track.h"
 #include "pc/channel.h"
-#include "pc/channelmanager.h"
-#include "pc/dtlssrtptransport.h"
-#include "pc/localaudiosource.h"
-#include "pc/mediastream.h"
-#include "pc/rtpreceiver.h"
-#include "pc/rtpsender.h"
-#include "pc/rtptransportinternal.h"
-#include "pc/test/fakevideotracksource.h"
-#include "pc/videotrack.h"
+#include "pc/channel_manager.h"
+#include "pc/dtls_srtp_transport.h"
+#include "pc/local_audio_source.h"
+#include "pc/media_stream.h"
+#include "pc/rtp_receiver.h"
+#include "pc/rtp_sender.h"
+#include "pc/rtp_transport_internal.h"
+#include "pc/test/fake_video_track_source.h"
+#include "pc/video_track.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/gunit.h"
 #include "rtc_base/scoped_ref_ptr.h"