Implement ChromeOS mime type extension mappings.

net/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/module_args/v8.gni")
 import("//url/config.gni")
 import("//testing/test.gni")
@@ skipping 463 matching lines @@
       "base/address_tracker_linux.cc",
       "base/address_tracker_linux.h",
       "base/net_util_linux.cc",
       "base/net_util_linux.h",
       "base/platform_mime_util_linux.cc",
     ]
     set_sources_assignment_filter(sources_assignment_filter)
     deps += [ ":net_jni_headers" ]
   }
 
+  if (!is_chromeos) {
+    sources -= [ "base/platform_mime_util_chromeos.cc" ]
+  }
+
   if (use_icu_alternatives_on_android) {
     sources += [
       "base/net_string_util_icu_alternatives_android.cc",
       "base/net_string_util_icu_alternatives_android.h",
     ]
   } else {
     deps += [
       "//base:i18n",
       "//third_party/icu",
     ]
@@ skipping 1119 matching lines @@
   } else {
     sources -= [ "proxy/proxy_resolver_perftest.cc" ]
   }
 
   if (is_win && icu_use_data_file) {
     # This is needed to trigger the dll copy step on windows.
     # TODO(mark): Specifying this here shouldn't be necessary.
     deps += [ "//third_party/icu:icudata" ]
   }
 }