Fix presubmit script for .cc files which include system files first.

PRESUBMIT_test.py

Index: PRESUBMIT_test.py
diff --git a/PRESUBMIT_test.py b/PRESUBMIT_test.py
index e0de9674d3372498ad8ea94828154e46135dd9be..3e174011ddfa2ffb69432eab4f606fce2b7d3454 100755
--- a/PRESUBMIT_test.py
+++ b/PRESUBMIT_test.py
@@ -134,6 +134,18 @@ class IncludeOrderTest(unittest.TestCase):
         mock_input_api, mock_file, range(1, len(contents) + 1))
     self.assertEqual(0, len(warnings))
 
+  def testSpecialFirstInclude7(self):
+    mock_input_api = MockInputApi()
+    contents = ['#include <windows.h>',
+                '#include "some/path/foo.h"',
+                '#include <set>',
+                '#include "a/header.h"']
+    mock_file = MockFile('some/path/foo.cc', contents)
+    warnings = PRESUBMIT._CheckIncludeOrderInFile(
+        mock_input_api, mock_file, range(1, len(contents) + 1))
+    print warnings
+    self.assertEqual(0, len(warnings))
+
   def testOrderAlreadyWrong(self):
     scope = [(1, '#include "b.h"'),
              (2, '#include "a.h"'),