Drop u'', it was used inconsistently and breaks for nothing with Python 3.2

rest_framework/tests/serializer.py

@@ -1336,8 +1336,8 @@ class FieldLabelTest(TestCase):
         serializer = self.serializer_class()
         text_field = serializer.fields['text']
 
-        self.assertEquals(u'Text comes here', text_field.label)
-        self.assertEquals(u'Text description.', text_field.help_text)
+        self.assertEquals('Text comes here', text_field.label)
+        self.assertEquals('Text description.', text_field.help_text)
 
     def test_field_ctor(self):
         """