Accept svn:mime-type as a valid svn property.

tests/rietveld_test.py

Index: tests/rietveld_test.py
diff --git a/tests/rietveld_test.py b/tests/rietveld_test.py
index bad929c38679aea5fa0324bbdf6bb11354abee39..70bb320bd7c180ad117ab43a6d3fcccbc2f3c54f 100755
--- a/tests/rietveld_test.py
+++ b/tests/rietveld_test.py
@@ -289,6 +289,15 @@ class RietveldTest(unittest.TestCase):
           '   + LF\n',
           'foo'))
 
+    # http://codereview.chromium.org/api/9139006/7001
+    self.assertEquals(
+        [('svn:mime-type', 'image/png')],
+        rietveld.Rietveld.parse_svn_properties(
+          '\n'
+          'Added: svn:mime-type\n'
+          '   + image/png\n',
+          'foo'))
+
   def test_bad_svn_properties(self):
     try:
       rietveld.Rietveld.parse_svn_properties(u'\n', 'foo')