(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/common_audio/wav_file_unittest.cc b/common_audio/wav_file_unittest.cc
index d40229a..b7e5d3f 100644
--- a/common_audio/wav_file_unittest.cc
+++ b/common_audio/wav_file_unittest.cc
@@ -17,7 +17,7 @@
 #include "common_audio/wav_file.h"
 #include "common_audio/wav_header.h"
 #include "test/gtest.h"
-#include "test/testsupport/fileutils.h"
+#include "test/testsupport/file_utils.h"
 
 // WavWriterTest.CPPFileDescriptor and WavWriterTest.CPP flaky on Mac.
 // See webrtc:9247.