(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/rtc_base/ssl_adapter_unittest.cc b/rtc_base/ssl_adapter_unittest.cc
index c84c668..9774c0a 100644
--- a/rtc_base/ssl_adapter_unittest.cc
+++ b/rtc_base/ssl_adapter_unittest.cc
@@ -14,15 +14,15 @@
 
 #include "absl/memory/memory.h"
 #include "rtc_base/gunit.h"
-#include "rtc_base/ipaddress.h"
-#include "rtc_base/messagedigest.h"
-#include "rtc_base/socketstream.h"
-#include "rtc_base/ssladapter.h"
-#include "rtc_base/sslidentity.h"
-#include "rtc_base/sslstreamadapter.h"
+#include "rtc_base/ip_address.h"
+#include "rtc_base/message_digest.h"
+#include "rtc_base/socket_stream.h"
+#include "rtc_base/ssl_adapter.h"
+#include "rtc_base/ssl_identity.h"
+#include "rtc_base/ssl_stream_adapter.h"
 #include "rtc_base/stream.h"
-#include "rtc_base/stringencode.h"
-#include "rtc_base/virtualsocketserver.h"
+#include "rtc_base/string_encode.h"
+#include "rtc_base/virtual_socket_server.h"
 #include "test/gmock.h"
 
 using ::testing::_;