Remove GYP files.

third_party/decklink/decklink.gyp

Index: third_party/decklink/decklink.gyp
diff --git a/third_party/decklink/decklink.gyp b/third_party/decklink/decklink.gyp
deleted file mode 100644
index 30772c48ffffca50de93a20b982fd7a759601fce..0000000000000000000000000000000000000000
--- a/third_party/decklink/decklink.gyp
+++ /dev/null
@@ -1,20 +0,0 @@
-# Copyright 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.
-
-# GN version: //third_party/decklink
-{
-  'conditions': [
-    ['OS=="mac"', {
-      'targets': [
-        {
-          'target_name': 'decklink',
-          'type': 'static_library',
-          'sources' : [
-            'mac/include/DeckLinkAPIDispatch.cpp',
-          ],
-        },  # target decklink
-      ]
-     }],
-  ]
-}