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 229 matching lines @@
       'base/keygen_handler_openssl.cc',
       'base/keygen_handler_win.cc',
       # TODO(tc): gnome-vfs? xdgmime? /etc/mime.types?
       'base/layered_network_delegate.cc',
       'base/layered_network_delegate.h',
       'base/linked_hash_map.h',
       'base/load_flags.h',
       'base/load_flags_list.h',
       'base/load_states.h',
       'base/load_states_list.h',
+      'base/mime_extension_chromeos.cc',
+      'base/mime_extension_chromeos.h',
       'base/mime_sniffer.cc',
       'base/mime_sniffer.h',
       'base/mime_util.cc',
       'base/mime_util.h',
       'base/net_errors_win.cc',
       'base/net_info_source_list.h',
       'base/net_util_linux.cc',
       'base/net_util_mac.cc',
       'base/net_util_win.cc',
       'base/network_activity_monitor.cc',
@@ skipping 1549 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',
   }
 }