(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/call/call.h b/call/call.h
index c0e31c0..ab834f3 100644
--- a/call/call.h
+++ b/call/call.h
@@ -15,7 +15,7 @@
 #include <string>
 #include <vector>
 
-#include "api/mediatypes.h"
+#include "api/media_types.h"
 #include "call/audio_receive_stream.h"
 #include "call/audio_send_stream.h"
 #include "call/call_config.h"
@@ -24,10 +24,10 @@
 #include "call/rtp_transport_controller_send_interface.h"
 #include "call/video_receive_stream.h"
 #include "call/video_send_stream.h"
-#include "rtc_base/bitrateallocationstrategy.h"
-#include "rtc_base/copyonwritebuffer.h"
+#include "rtc_base/bitrate_allocation_strategy.h"
+#include "rtc_base/copy_on_write_buffer.h"
 #include "rtc_base/network/sent_packet.h"
-#include "rtc_base/networkroute.h"
+#include "rtc_base/network_route.h"
 
 namespace webrtc {