Remove all .gyp and .gypi files.

build/common_untrusted.gypi

-# 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.
-
-# This GYP file should be included for every target in Chromium that is built
-# using the NaCl toolchain.
-{
-  'includes': [
-    '../native_client/build/untrusted.gypi',
-  ],
-  'target_defaults': {
-    'conditions': [
-      # TODO(bradnelson): Drop this once the nacl side does the same.
-      ['target_arch=="x64"', {
-        'variables': {
-          'enable_x86_32': 0,
-        },
-      }],
-      ['target_arch=="ia32" and OS!="win"', {
-        'variables': {
-          'enable_x86_64': 0,
-        },
-      }],
-      ['target_arch=="arm"', {
-        'variables': {
-          'clang': 1,
-        },
-        'defines': [
-          # Needed by build/build_config.h processor architecture detection.
-          '__ARMEL__',
-          # Needed by base/third_party/nspr/prtime.cc.
-          '__arm__',
-          # Disable ValGrind. The assembly code it generates causes the build
-          # to fail.
-          'NVALGRIND',
-        ],
-      }],
-    ],
-  },
-}