(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/pc/test/android_test_initializer.cc b/pc/test/android_test_initializer.cc
index a67716d..584aeda 100644
--- a/pc/test/android_test_initializer.cc
+++ b/pc/test/android_test_initializer.cc
@@ -8,7 +8,7 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "pc/test/androidtestinitializer.h"
+#include "pc/test/android_test_initializer.h"
 
 #include <pthread.h>
 
@@ -28,7 +28,7 @@
 // TODO(phoglund): This include is also to a target we can't really depend on.
 // We need to either break it out into a smaller target or find some way to
 // not use it.
-#include "rtc_base/ssladapter.h"
+#include "rtc_base/ssl_adapter.h"
 
 namespace webrtc {