Remove GYP files.

third_party/jsr-305/jsr-305.gyp

-# Copyright (c) 2012 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': [
-    {
-      'target_name': 'jsr_305_javalib',
-      'type': 'none',
-      'variables': {
-        # The sources are not located in a folder that is called src/, so we
-        # need to set it in additional_src_dirs parameter instead.
-        'java_in_dir': '../../build/android/empty',
-        'additional_src_dirs': [ 'src/ri/' ],
-      },
-      'includes': [ '../../build/java.gypi' ],
-    },
-  ]
-}