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

webrtc/common_video/bitrate_adjuster_unittest.cc

Index: webrtc/common_video/bitrate_adjuster_unittest.cc
diff --git a/webrtc/common_video/bitrate_adjuster_unittest.cc b/webrtc/common_video/bitrate_adjuster_unittest.cc
index 5e509b379379f6929fdf78cc34aa40e0f3b0c16b..b6152ac8444f3ef1e70e18d6954a3e9c20822ac9 100644
--- a/webrtc/common_video/bitrate_adjuster_unittest.cc
+++ b/webrtc/common_video/bitrate_adjuster_unittest.cc
@@ -8,10 +8,9 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "webrtc/test/gtest.h"
-
 #include "webrtc/common_video/include/bitrate_adjuster.h"
 #include "webrtc/system_wrappers/include/clock.h"
+#include "webrtc/test/gtest.h"
 
 namespace webrtc {