Fix typo in FRIEND_TEST presubmit nag.

BUG=NONE
TEST=NONE
TBR=maruel
Review URL: http://codereview.chromium.org/8687033

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111943 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index c97c1ac9..6f9f5307 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -174,7 +174,7 @@
   if not problems:
     return []
   return [output_api.PresubmitPromptWarning('Chromium code should not use '
-      'gtest\'s FRIEND_TEST() macro. Include base/gtest_prod_util.h and use'
+      'gtest\'s FRIEND_TEST() macro. Include base/gtest_prod_util.h and use '
       'FRIEND_TEST_ALL_PREFIXES() instead.\n' + '\n'.join(problems))]