Make missing PRESUBMIT.py warning consistent with others.

Review URL: https://codereview.chromium.org/188013003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@255125 0039d316-1c4b-4281-b951-d872f2087c98

presubmit_support.py

@@ -1133,7 +1133,7 @@ def DoGetTrySlaves(change,
   """
   presubmit_files = ListRelevantPresubmitFiles(changed_files, repository_root)
   if not presubmit_files and verbose:
-    output_stream.write("Warning, no presubmit.py found.\n")
+    output_stream.write("Warning, no PRESUBMIT.py found.\n")
   results = []
   executer = GetTrySlavesExecuter()