[MIPS] Add support to gyp files to build Native Client inside of Chromium

src/trusted/validator/x86/ncval_seg_sfi/ncval_seg_sfi.gyp

 # Copyright (c) 2011 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # TODO(bradchen): eliminate need for the warning flag removals below
 {
   'includes': [
     '../../../../../build/common.gypi',
   ],
   'target_defaults': {
@@ skipping 154 matching lines @@
           'variables': {
             'target_base': 'ncval_seg_sfi',
           },
           'dependencies': [
             'ncdis_seg_sfi_x86_64',
             '<(DEPTH)/native_client/src/trusted/validator_x86/validator_x86.gyp:nccopy_x86_64',
             '<(DEPTH)/native_client/src/trusted/validator/x86/validate_x86.gyp:ncval_base_x86_64'          ],
           'hard_dependency': 1,
         }],
     }],
-    [ 'target_arch=="arm"', {
-      'targets': []
-    }],
   ],
 }