(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/media/base/fake_media_engine.h b/media/base/fake_media_engine.h
index e3a0638..ff8f44d 100644
--- a/media/base/fake_media_engine.h
+++ b/media/base/fake_media_engine.h
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef MEDIA_BASE_FAKEMEDIAENGINE_H_
-#define MEDIA_BASE_FAKEMEDIAENGINE_H_
+#ifndef MEDIA_BASE_FAKE_MEDIA_ENGINE_H_
+#define MEDIA_BASE_FAKE_MEDIA_ENGINE_H_
 
 #include <list>
 #include <map>
@@ -20,14 +20,14 @@
 #include <vector>
 
 #include "api/call/audio_sink.h"
-#include "media/base/audiosource.h"
-#include "media/base/mediaengine.h"
-#include "media/base/rtputils.h"
-#include "media/base/streamparams.h"
-#include "media/engine/webrtcvideoengine.h"
+#include "media/base/audio_source.h"
+#include "media/base/media_engine.h"
+#include "media/base/rtp_utils.h"
+#include "media/base/stream_params.h"
+#include "media/engine/webrtc_video_engine.h"
 #include "modules/audio_processing/include/audio_processing.h"
-#include "rtc_base/copyonwritebuffer.h"
-#include "rtc_base/networkroute.h"
+#include "rtc_base/copy_on_write_buffer.h"
+#include "rtc_base/network_route.h"
 
 using webrtc::RtpExtension;
 
@@ -594,4 +594,4 @@
 
 }  // namespace cricket
 
-#endif  // MEDIA_BASE_FAKEMEDIAENGINE_H_
+#endif  // MEDIA_BASE_FAKE_MEDIA_ENGINE_H_