(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/logging/rtc_event_log/encoder/blob_encoding.cc b/logging/rtc_event_log/encoder/blob_encoding.cc
index c11e7ba..48316b0 100644
--- a/logging/rtc_event_log/encoder/blob_encoding.cc
+++ b/logging/rtc_event_log/encoder/blob_encoding.cc
@@ -12,7 +12,7 @@
 
 #include <cstdint>
 
-#include "logging/rtc_event_log/encoder/varint.h"
+#include "logging/rtc_event_log/encoder/var_int.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/logging.h"