Check alpha-sorting of includes during presubmit.

test/cctest/test-threads.cc

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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 #include "src/v8.h"
+#include "test/cctest/cctest.h"
 
+#include "src/isolate.h"
 #include "src/platform.h"
-#include "src/isolate.h"
-
-#include "test/cctest/cctest.h"
 
 
 enum Turn {
   FILL_CACHE,
   CLEAN_CACHE,
   SECOND_TIME_FILL_CACHE,
   DONE
 };
 
 static Turn turn = FILL_CACHE;
@@ skipping 141 matching lines @@
     Join();
   }
 };
 
 
 TEST(ThreadJoinSelf) {
   ThreadC thread;
   thread.Start();
   thread.Join();
 }