Add untrusted NaCl build for PPAPI proxy.

base/base_untrusted.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../native_client/build/untrusted.gypi',
@@ skipping 14 matching lines @@
             'sources': [
               'atomicops_internals_x86_gcc.cc',
               'string16.cc',
               'sync_socket_nacl.cc',
               'third_party/nspr/prtime.cc',
               'time_posix.cc',
             ],
           },
           'dependencies': [
             '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
-            '<(DEPTH)/native_client/src/untrusted/pthread/pthread.gyp:pthread_lib',
-            '<(DEPTH)/native_client/src/untrusted/nacl/nacl.gyp:nacl_lib_newlib',
           ],
         },
       ],
     }],
   ],
 }