(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/media/sctp/sctp_transport.cc b/media/sctp/sctp_transport.cc
index 73e4185..65c2181 100644
--- a/media/sctp/sctp_transport.cc
+++ b/media/sctp/sctp_transport.cc
@@ -18,7 +18,7 @@
 };
 }  // namespace
 
-#include "media/sctp/sctptransport.h"
+#include "media/sctp/sctp_transport.h"
 
 #include <stdarg.h>
 #include <stdio.h>
@@ -27,12 +27,12 @@
 #include <memory>
 
 #include "media/base/codec.h"
-#include "media/base/mediaconstants.h"
-#include "media/base/streamparams.h"
-#include "p2p/base/dtlstransportinternal.h"  // For PF_NORMAL
+#include "media/base/media_constants.h"
+#include "media/base/stream_params.h"
+#include "p2p/base/dtls_transport_internal.h"  // For PF_NORMAL
 #include "rtc_base/arraysize.h"
-#include "rtc_base/copyonwritebuffer.h"
-#include "rtc_base/criticalsection.h"
+#include "rtc_base/copy_on_write_buffer.h"
+#include "rtc_base/critical_section.h"
 #include "rtc_base/helpers.h"
 #include "rtc_base/logging.h"
 #include "rtc_base/numerics/safe_conversions.h"
diff --git a/media/sctp/sctp_transport.h b/media/sctp/sctp_transport.h
index 5c2a750..f7ddd87 100644
--- a/media/sctp/sctp_transport.h
+++ b/media/sctp/sctp_transport.h
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef MEDIA_SCTP_SCTPTRANSPORT_H_
-#define MEDIA_SCTP_SCTPTRANSPORT_H_
+#ifndef MEDIA_SCTP_SCTP_TRANSPORT_H_
+#define MEDIA_SCTP_SCTP_TRANSPORT_H_
 
 #include <errno.h>
 
@@ -19,14 +19,14 @@
 #include <string>
 #include <vector>
 
-#include "rtc_base/asyncinvoker.h"
-#include "rtc_base/constructormagic.h"
-#include "rtc_base/copyonwritebuffer.h"
+#include "rtc_base/async_invoker.h"
+#include "rtc_base/constructor_magic.h"
+#include "rtc_base/copy_on_write_buffer.h"
 #include "rtc_base/third_party/sigslot/sigslot.h"
 #include "rtc_base/thread.h"
 // For SendDataParams/ReceiveDataParams.
-#include "media/base/mediachannel.h"
-#include "media/sctp/sctptransportinternal.h"
+#include "media/base/media_channel.h"
+#include "media/sctp/sctp_transport_internal.h"
 
 // Defined by "usrsctplib/usrsctp.h"
 struct sockaddr_conn;
@@ -228,4 +228,4 @@
 
 }  // namespace cricket
 
-#endif  // MEDIA_SCTP_SCTPTRANSPORT_H_
+#endif  // MEDIA_SCTP_SCTP_TRANSPORT_H_
diff --git a/media/sctp/sctp_transport_internal.h b/media/sctp/sctp_transport_internal.h
index 4c3b542..12f1782 100644
--- a/media/sctp/sctp_transport_internal.h
+++ b/media/sctp/sctp_transport_internal.h
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef MEDIA_SCTP_SCTPTRANSPORTINTERNAL_H_
-#define MEDIA_SCTP_SCTPTRANSPORTINTERNAL_H_
+#ifndef MEDIA_SCTP_SCTP_TRANSPORT_INTERNAL_H_
+#define MEDIA_SCTP_SCTP_TRANSPORT_INTERNAL_H_
 
 // TODO(deadbeef): Move SCTP code out of media/, and make it not depend on
 // anything in media/.
@@ -18,13 +18,13 @@
 #include <string>
 #include <vector>
 
-#include "rtc_base/copyonwritebuffer.h"
+#include "rtc_base/copy_on_write_buffer.h"
 #include "rtc_base/thread.h"
 // For SendDataParams/ReceiveDataParams.
 // TODO(deadbeef): Use something else for SCTP. It's confusing that we use an
 // SSRC field for SID.
-#include "media/base/mediachannel.h"
-#include "p2p/base/packettransportinternal.h"
+#include "media/base/media_channel.h"
+#include "p2p/base/packet_transport_internal.h"
 
 namespace cricket {
 
@@ -138,4 +138,4 @@
 
 }  // namespace cricket
 
-#endif  // MEDIA_SCTP_SCTPTRANSPORTINTERNAL_H_
+#endif  // MEDIA_SCTP_SCTP_TRANSPORT_INTERNAL_H_
diff --git a/media/sctp/sctp_transport_unittest.cc b/media/sctp/sctp_transport_unittest.cc
index c63bde8..0170785 100644
--- a/media/sctp/sctp_transport_unittest.cc
+++ b/media/sctp/sctp_transport_unittest.cc
@@ -15,12 +15,12 @@
 #include <string>
 #include <vector>
 
-#include "media/sctp/sctptransport.h"
-#include "p2p/base/fakedtlstransport.h"
-#include "rtc_base/copyonwritebuffer.h"
+#include "media/sctp/sctp_transport.h"
+#include "p2p/base/fake_dtls_transport.h"
+#include "rtc_base/copy_on_write_buffer.h"
 #include "rtc_base/gunit.h"
 #include "rtc_base/logging.h"
-#include "rtc_base/messagequeue.h"
+#include "rtc_base/message_queue.h"
 #include "rtc_base/thread.h"
 #include "test/gtest.h"