(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}

modules/video_coding/utility/ivf_file_writer.h

@@ -17,9 +17,9 @@
 
 #include "api/video/encoded_image.h"
 #include "common_types.h"  // NOLINT(build/include)
-#include "rtc_base/constructormagic.h"
+#include "rtc_base/constructor_magic.h"
 #include "rtc_base/file.h"
-#include "rtc_base/timeutils.h"
+#include "rtc_base/time_utils.h"
 
 namespace webrtc {
 

modules/video_coding/utility/ivf_file_writer_unittest.cc

@@ -17,7 +17,7 @@
 #include "modules/rtp_rtcp/source/byte_io.h"
 #include "rtc_base/platform_file.h"
 #include "test/gtest.h"
-#include "test/testsupport/fileutils.h"
+#include "test/testsupport/file_utils.h"
 
 namespace webrtc {
 

modules/video_coding/utility/quality_scaler.cc

@@ -17,7 +17,7 @@
 #include "rtc_base/logging.h"
 #include "rtc_base/numerics/exp_filter.h"
 #include "rtc_base/task_queue.h"
-#include "rtc_base/timeutils.h"
+#include "rtc_base/time_utils.h"
 
 // TODO(kthelgason): Some versions of Android have issues with log2.
 // See https://code.google.com/p/android/issues/detail?id=212634 for details

modules/video_coding/utility/simulcast_rate_allocator.h

@@ -18,7 +18,7 @@
 #include "api/video/video_bitrate_allocation.h"
 #include "api/video/video_bitrate_allocator.h"
 #include "api/video_codecs/video_codec.h"
-#include "rtc_base/constructormagic.h"
+#include "rtc_base/constructor_magic.h"
 
 namespace webrtc {
 

modules/video_coding/utility/vp9_uncompressed_header_parser.cc

@@ -9,7 +9,7 @@
  */
 #include "modules/video_coding/utility/vp9_uncompressed_header_parser.h"
 
-#include "rtc_base/bitbuffer.h"
+#include "rtc_base/bit_buffer.h"
 #include "rtc_base/logging.h"
 
 namespace webrtc {