Delete PRESUBMIT.py

This presubmit hook only applies to people changing webgl dom IDL in the upstream chromium project, not to use, who just use the IDL
diff --git a/modules/webgl/PRESUBMIT.py b/modules/webgl/PRESUBMIT.py
deleted file mode 100644
index 492a16f..0000000
--- a/modules/webgl/PRESUBMIT.py
+++ /dev/null
@@ -1,26 +0,0 @@
-# Copyright (c) 2016 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 Source/modules/webgl.
-
-See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
-for more details about the presubmit API built into depot_tools.
-"""
-
-def PostUploadHook(cl, change, output_api):
-    """git cl upload will call this hook after the issue is created/modified.
-
-    This hook modifies the CL description in order to run extra GPU
-    tests (in particular, the WebGL 2.0 conformance tests) in addition
-    to the regular CQ try bots. This test suite is too large to run
-    against all Chromium commits, but should be run against changes
-    likely to affect these tests.
-    """
-    return output_api.EnsureCQIncludeTrybotsAreAdded(
-        cl,
-        ['master.tryserver.chromium.linux:linux_optional_gpu_tests_rel',
-         'master.tryserver.chromium.mac:mac_optional_gpu_tests_rel',
-         'master.tryserver.chromium.win:win_optional_gpu_tests_rel',
-         'master.tryserver.chromium.android:android_optional_gpu_tests_rel'],
-        'Automatically added optional GPU tests to run on CQ.')