Sort #includes that got unsorted when gmock.h and gtest.h moved to webrtc/test/

webrtc/modules/video_coding/timing_unittest.cc

Index: webrtc/modules/video_coding/timing_unittest.cc
diff --git a/webrtc/modules/video_coding/timing_unittest.cc b/webrtc/modules/video_coding/timing_unittest.cc
index 88fb3d71a8722217d7e0bce08b06b24ec474f2d2..3aaa46d65db7cb738952018beb37163a9a42d18e 100644
--- a/webrtc/modules/video_coding/timing_unittest.cc
+++ b/webrtc/modules/video_coding/timing_unittest.cc
@@ -12,14 +12,13 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-#include "webrtc/test/gtest.h"
-
 #include "webrtc/modules/video_coding/include/video_coding.h"
 #include "webrtc/modules/video_coding/internal_defines.h"
-#include "webrtc/modules/video_coding/timing.h"
 #include "webrtc/modules/video_coding/test/test_util.h"
+#include "webrtc/modules/video_coding/timing.h"
 #include "webrtc/system_wrappers/include/clock.h"
 #include "webrtc/system_wrappers/include/trace.h"
+#include "webrtc/test/gtest.h"
 #include "webrtc/test/testsupport/fileutils.h"
 
 namespace webrtc {