Remove base/metrics/* code from NaCl IPC proxy build.

base/base.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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 576 matching lines @@
                'process_util.cc',
                'process_util_posix.cc',
                'rand_util_posix.cc',
                'scoped_native_library.cc',
                'scoped_temp_dir.cc',
                'shared_memory_posix.cc',
                'sys_info_posix.cc',
                'threading/sequenced_worker_pool.cc',
                'third_party/dynamic_annotations/dynamic_annotations.c',
             ],
+            # Metrics won't work in the NaCl sandbox.
+            'sources/': [ ['exclude', '^metrics/'] ],
           }],
           ['OS == "android" and >(nacl_untrusted_build)==0', {
             'sources!': [
               'base_paths_posix.cc',
               'files/file_path_watcher_kqueue.cc',
               'files/file_path_watcher_stub.cc',
               'system_monitor/system_monitor_posix.cc',
             ],
             'sources/': [
               ['include', '^files/file_path_watcher_linux\\.cc$'],
@@ skipping 100 matching lines @@
           # Remove all unnecessary files for build_nexe.py to avoid exceeding
           # command-line-string limitation when building NaCl on Windows.
           ['OS == "win" and >(nacl_untrusted_build)==1', {
               'sources/': [ ['exclude', '\\.h$'] ],
           }],
         ],
       }],
     ],
   },
 }