(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/modules/audio_processing/audio_processing_impl.cc b/modules/audio_processing/audio_processing_impl.cc
index c0058c7..eec4c33 100644
--- a/modules/audio_processing/audio_processing_impl.cc
+++ b/modules/audio_processing/audio_processing_impl.cc
@@ -37,12 +37,12 @@
 #include "modules/audio_processing/residual_echo_detector.h"
 #include "modules/audio_processing/transient/transient_suppressor.h"
 #include "modules/audio_processing/voice_detection_impl.h"
-#include "rtc_base/atomicops.h"
+#include "rtc_base/atomic_ops.h"
 #include "rtc_base/checks.h"
-#include "rtc_base/constructormagic.h"
+#include "rtc_base/constructor_magic.h"
 #include "rtc_base/logging.h"
-#include "rtc_base/refcountedobject.h"
-#include "rtc_base/timeutils.h"
+#include "rtc_base/ref_counted_object.h"
+#include "rtc_base/time_utils.h"
 #include "rtc_base/trace_event.h"
 #include "system_wrappers/include/metrics.h"