Cleanup: Presubmit API is built into depot_tools.

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

BUG=None
R=maruel@chromium.org
TBR=maruel@chromium.org
NOPRESUBMIT=true

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

Cr-Original-Commit-Position: refs/heads/master@{#314039}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 78bb92f45822e605c46d303b66a7bddc9706b9d3

android/PRESUBMIT.py

@@ -5,7 +5,7 @@
 """Presubmit script for android buildbot.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
-details on the presubmit API built into gcl.
+details on the presubmit API built into depot_tools.
 """
 
 _DELETIONS_ONLY_FILES = (

ios/PRESUBMIT.py

@@ -7,7 +7,7 @@ import os
 """Chromium presubmit script for src/tools/ios.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
-for more details on the presubmit API built into gcl.
+for more details on the presubmit API built into depot_tools.
 """
 
 WHITELIST_FILE = 'build/ios/grit_whitelist.txt'