Remove PPAPI gyp files.

ppapi/ppapi_shared_nacl.gyp

-# 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.
-
-{
-  'variables': {
-    'chromium_code': 1,
-  },
-  'includes': [
-    '../build/common_untrusted.gypi',
-    'ppapi_shared.gypi',
-  ],
-  'conditions': [
-    ['disable_nacl==0 and disable_nacl_untrusted==0', {
-      'targets': [
-        {
-          'target_name': 'ppapi_shared_nacl',
-          'type': 'none',
-          'variables': {
-            'ppapi_shared_target': 1,
-            'nacl_win64_target': 0,
-            'nacl_untrusted_build': 1,
-            'nlib_target': 'libppapi_shared_nacl.a',
-            'build_glibc': 0,
-            'build_newlib': 0,
-            'build_irt': 1,
-            'build_pnacl_newlib': 0,
-            'build_nonsfi_helper': 1,
-          },
-          'include_dirs': [
-            '..',
-          ],
-          'dependencies': [
-            '../base/base_nacl.gyp:base_nacl',
-            '../base/base_nacl.gyp:base_nacl_nonsfi',
-            '../gpu/command_buffer/command_buffer_nacl.gyp:gles2_utils_nacl',
-            '../gpu/gpu_nacl.gyp:command_buffer_client_nacl',
-            '../gpu/gpu_nacl.gyp:gles2_implementation_nacl',
-            '../media/media_nacl.gyp:shared_memory_support_nacl',
-            '../third_party/khronos/khronos.gyp:khronos_headers',
-            '../ui/gfx/gfx_nacl.gyp:gfx_geometry_nacl',
-          ],
-        },
-      ],
-    }],
-  ],
-}