Implement ChromeOS mime type extension mappings.

net/net.gypi

 # 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.
 
 # This file is shared between the regular GYP build, the NaCl GYP build, and
 # the GN build. For GN support, it must have no conditionals or anything like
 # that beyond the simple one-level-deep dictionary of values.
 {
   'variables': {
     # Subset of net source files that are compiled for NaCl (net_nacl target).
@@ skipping 258 matching lines @@
       'base/network_change_notifier_win.h',
       'base/network_config_watcher_mac.cc',
       'base/network_config_watcher_mac.h',
       'base/network_delegate.cc',
       'base/network_delegate.h',
       'base/network_delegate_impl.cc',
       'base/network_delegate_impl.h',
       'base/nss_memio.c',
       'base/nss_memio.h',
       'base/platform_mime_util.h',
+      'base/platform_mime_util_chromeos.cc',
       'base/platform_mime_util_linux.cc',
       'base/platform_mime_util_mac.mm',
       'base/platform_mime_util_win.cc',
       'base/prioritized_dispatcher.cc',
       'base/prioritized_dispatcher.h',
       'base/priority_queue.h',
       'base/proxy_delegate.h',
       'base/request_priority.cc',
       'base/request_priority.h',
       'base/sdch_dictionary.cc',
@@ skipping 1520 matching lines @@
       'base/mac/url_conversions_unittest.mm',
     ],
     'net_docs_script': 'tools/net_docs/net_docs.py',
     'net_docs_sources': [
       'README.md',
       'sdch/README.md',
     ],
     'net_docs_output_dir': '<(PRODUCT_DIR)/net/docs',
   }
 }