Removed Cardboard SDK from third_party

third_party/cardboard-java/cardboard.gyp

Index: third_party/cardboard-java/cardboard.gyp
diff --git a/third_party/cardboard-java/cardboard.gyp b/third_party/cardboard-java/cardboard.gyp
deleted file mode 100644
index 4953521faac510363fe225a270c79289f192a3f0..0000000000000000000000000000000000000000
--- a/third_party/cardboard-java/cardboard.gyp
+++ /dev/null
@@ -1,23 +0,0 @@
-# Copyright 2015 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.
-
-{
-  'targets': [
-    {
-      # GN: //third_party/cardboard-java:cardboard_java
-      'target_name': 'cardboard_jar',
-      'type': 'none',
-      'dependencies': [
-        '../android_protobuf/android_protobuf.gyp:protobuf_nano_javalib',
-      ],
-      'variables': {
-        'jar_path': 'src/CardboardSample/libs/cardboard.jar',
-      },
-      'includes': [
-        '../../build/java_prebuilt.gypi',
-      ]
-    },
-  ],
-}
-