Cleanup: Presubmit API is built into depot_tools.

Not in gcl, which probably these days nobody working on Chromium uses.

BUG=None
[email protected]
[email protected]
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/887033002

Cr-Commit-Position: refs/heads/master@{#314039}
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index a931d4b..3326d8c 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -5,7 +5,7 @@
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
-for more details about the presubmit API built into gcl.
+for more details about the presubmit API built into depot_tools.
 """