(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/pc/ice_server_parsing.cc b/pc/ice_server_parsing.cc
index 1bb5d87..533d597 100644
--- a/pc/ice_server_parsing.cc
+++ b/pc/ice_server_parsing.cc
@@ -8,19 +8,19 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "pc/iceserverparsing.h"
+#include "pc/ice_server_parsing.h"
 
 #include <stddef.h>
 #include <cctype>  // For std::isdigit.
 #include <string>
 
-#include "p2p/base/portinterface.h"
+#include "p2p/base/port_interface.h"
 #include "rtc_base/arraysize.h"
 #include "rtc_base/checks.h"
-#include "rtc_base/ipaddress.h"
+#include "rtc_base/ip_address.h"
 #include "rtc_base/logging.h"
-#include "rtc_base/socketaddress.h"
-#include "rtc_base/stringencode.h"
+#include "rtc_base/socket_address.h"
+#include "rtc_base/string_encode.h"
 
 namespace webrtc {