(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/rtc_base/socket.h b/rtc_base/socket.h
index 84a0e84..a2b65d1 100644
--- a/rtc_base/socket.h
+++ b/rtc_base/socket.h
@@ -25,8 +25,8 @@
 #include "rtc_base/win32.h"
 #endif
 
-#include "rtc_base/constructormagic.h"
-#include "rtc_base/socketaddress.h"
+#include "rtc_base/constructor_magic.h"
+#include "rtc_base/socket_address.h"
 
 // Rather than converting errors into a private namespace,
 // Reuse the POSIX socket api errors. Note this depends on