Check alpha-sorting of includes during presubmit.

test/cctest/test-dictionary.cc

Index: test/cctest/test-dictionary.cc
diff --git a/test/cctest/test-dictionary.cc b/test/cctest/test-dictionary.cc
index 87c58fa9d09c4f82319ba956a42f3564aa1ee6bf..9a1914237fe185f841125051b7feaac12c180416 100644
--- a/test/cctest/test-dictionary.cc
+++ b/test/cctest/test-dictionary.cc
@@ -26,15 +26,15 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "src/v8.h"
+#include "test/cctest/cctest.h"
 
 #include "src/api.h"
 #include "src/debug.h"
 #include "src/execution.h"
 #include "src/factory.h"
+#include "src/global-handles.h"
 #include "src/macro-assembler.h"
 #include "src/objects.h"
-#include "src/global-handles.h"
-#include "test/cctest/cctest.h"
 
 using namespace v8::internal;