Remove gpu bots from sub-directory PRESUBMITs.

ui/gl/PRESUBMIT.py

Index: ui/gl/PRESUBMIT.py
diff --git a/ui/gl/PRESUBMIT.py b/ui/gl/PRESUBMIT.py
deleted file mode 100644
index 67ad99164bca8987a7a4814b2bc44ca435e35412..0000000000000000000000000000000000000000
--- a/ui/gl/PRESUBMIT.py
+++ /dev/null
@@ -1,18 +0,0 @@
-# Copyright (c) 2014 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""Top-level presubmit script for ui/gl/.
-
-See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
-for more details about the presubmit API built into depot_tools.
-"""
-
-def GetPreferredTryMasters(project, change):
-  return {
-    'tryserver.chromium.gpu': {
-      'linux_gpu': set(['defaulttests']),
-      'mac_gpu': set(['defaulttests']),
-      'win_gpu': set(['defaulttests']),
-    }
-  }