Remove GYP files.

third_party/modp_b64/modp_b64.gyp

-# Copyright (c) 2009 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': 'modp_b64',
-      'type': 'static_library',
-      'toolsets': ['host', 'target'],
-      'sources': [
-        'modp_b64.cc',
-        'modp_b64.h',
-        'modp_b64_data.h',
-      ],
-      'include_dirs': [
-        '../..',
-      ],
-    },
-  ],
-  'conditions': [
-    ['OS == "win" and target_arch=="ia32"', {
-      # Even if we are building the browser for Win32, we need a few modules
-      # to be built for Win64, and this is a prerequsite.
-      'targets': [
-        {
-          'target_name': 'modp_b64_win64',
-          'type': 'static_library',
-          # We can't use dynamic_annotations target for win64 build since it is
-          # a 32-bit library.
-          'include_dirs': [
-            '../..',
-          ],
-          'sources': [
-            'modp_b64.cc',
-            'modp_b64.h',
-            'modp_b64_data.h',
-          ],
-          'configurations': {
-            'Common_Base': {
-              'msvs_target_platform': 'x64',
-            },
-          },
-        },
-      ],
-    }],
-  ],
-}