(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/p2p/base/async_stun_tcp_socket_unittest.cc b/p2p/base/async_stun_tcp_socket_unittest.cc
index 0203e48..70fddda 100644
--- a/p2p/base/async_stun_tcp_socket_unittest.cc
+++ b/p2p/base/async_stun_tcp_socket_unittest.cc
@@ -14,12 +14,12 @@
 #include <memory>
 #include <string>
 
-#include "p2p/base/asyncstuntcpsocket.h"
-#include "rtc_base/asyncsocket.h"
+#include "p2p/base/async_stun_tcp_socket.h"
+#include "rtc_base/async_socket.h"
 #include "rtc_base/network/sent_packet.h"
 #include "rtc_base/third_party/sigslot/sigslot.h"
 #include "rtc_base/thread.h"
-#include "rtc_base/virtualsocketserver.h"
+#include "rtc_base/virtual_socket_server.h"
 #include "test/gtest.h"
 
 namespace cricket {