In archive_layout_test_results, only support archiving to GS.

scripts/slave/chromium/archive_layout_test_results_unittest.py

Index: scripts/slave/chromium/archive_layout_test_results_unittest.py
diff --git a/scripts/slave/chromium/archive_layout_test_results_unittest.py b/scripts/slave/chromium/archive_layout_test_results_unittest.py
index 0b5eb318d4258d24d2e40ca886b21e3efd9e556b..fb4471bfb66a547bcedaea3074bba5e50aca6028 100755
--- a/scripts/slave/chromium/archive_layout_test_results_unittest.py
+++ b/scripts/slave/chromium/archive_layout_test_results_unittest.py
@@ -38,17 +38,6 @@ class ArchiveLayoutTestResultsTest(unittest.TestCase):
     self.assertFalse(archive_layout_test_results._IsActualResultFile(
         'foo-actual.html'))
 
-  def test_IsDiffFile(self):
-    self.assertTrue(archive_layout_test_results._IsDiffFile('a-diff.png'))
-    self.assertTrue(archive_layout_test_results._IsDiffFile('a-diff.txt'))
-    self.assertTrue(archive_layout_test_results._IsDiffFile('a-wdiff.txt'))
-    self.assertTrue(archive_layout_test_results._IsDiffFile('a-expected.txt'))
-    self.assertTrue(archive_layout_test_results._IsDiffFile('a-expected.html'))
-
-    self.assertFalse(archive_layout_test_results._IsDiffFile('a-diff.png.foo'))
-    self.assertFalse(archive_layout_test_results._IsDiffFile('a-diff.png.foo'))
-    self.assertFalse(archive_layout_test_results._IsDiffFile('foo-actual.html'))
-    self.assertFalse(archive_layout_test_results._IsDiffFile('results.html'))
 
 if __name__ == '__main__':
   unittest.main()