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

webrtc/system_wrappers/source/ntp_time_unittest.cc

Index: webrtc/system_wrappers/source/ntp_time_unittest.cc
diff --git a/webrtc/system_wrappers/source/ntp_time_unittest.cc b/webrtc/system_wrappers/source/ntp_time_unittest.cc
index 50943aede2c2408f0eac6107d98c1cc22b38b024..a5057897d858b34d999cc0038fd7eb28849d4c51 100644
--- a/webrtc/system_wrappers/source/ntp_time_unittest.cc
+++ b/webrtc/system_wrappers/source/ntp_time_unittest.cc
@@ -8,9 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "webrtc/test/gtest.h"
-
 #include "webrtc/system_wrappers/include/ntp_time.h"
+#include "webrtc/test/gtest.h"
 
 namespace webrtc {
 namespace {