NaCl/GYP: remove references to prep_toolchain.

components/tracing_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.
 
 {
   'includes': [
     '../build/common_untrusted.gypi',
   ],
   'conditions': [
     ['disable_nacl==0 and disable_nacl_untrusted==0', {
       'targets': [
         {
           'target_name': 'tracing_nacl',
           'type': 'none',
           'defines!': ['CONTENT_IMPLEMENTATION'],
           'dependencies': [
             '../base/base_nacl.gyp:base_nacl',
             '../base/base_nacl.gyp:base_nacl_nonsfi',
             '../ipc/ipc_nacl.gyp:ipc_nacl',
             '../ipc/ipc_nacl.gyp:ipc_nacl_nonsfi',
-            '../native_client/tools.gyp:prep_toolchain',
           ],
           'include_dirs': [
             '..',
           ],
           'variables': {
             'nacl_untrusted_build': 1,
             'nlib_target': 'libtracing_nacl.a',
             'build_glibc': 0,
             'build_newlib': 0,
             'build_irt': 1,
             'build_pnacl_newlib': 0,
             'build_nonsfi_helper': 1,
           },
           'sources': [
             'tracing/child_memory_dump_manager_delegate_impl.cc',
             'tracing/child_memory_dump_manager_delegate_impl.h',
             'tracing/child_trace_message_filter.cc',
             'tracing/child_trace_message_filter.h',
             'tracing/tracing_messages.cc',
             'tracing/tracing_messages.h',
           ],
         },
       ],
     }],
   ],
 }