Move Mime type handling to streamsPrivate API, so that it works on Desktop Chrome.

chrome/chrome_common.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'common',
       'type': 'static_library',
       'variables': {
@@ skipping 219 matching lines @@
         'common/extensions/manifest.cc',
         'common/extensions/manifest.h',
         'common/extensions/manifest_handler.cc',
         'common/extensions/manifest_handler.h',
         'common/extensions/manifest_handler_helpers.cc',
         'common/extensions/manifest_handler_helpers.h',
         'common/extensions/manifest_url_handler.cc',
         'common/extensions/manifest_url_handler.h',
         'common/extensions/message_bundle.cc',
         'common/extensions/message_bundle.h',
+        'common/extensions/mime_types_handler.cc',
+        'common/extensions/mime_types_handler.h',
         'common/extensions/permissions/api_permission.cc',
         'common/extensions/permissions/api_permission.h',
         'common/extensions/permissions/api_permission_set.cc',
         'common/extensions/permissions/api_permission_set.h',
         'common/extensions/permissions/bluetooth_device_permission.cc',
         'common/extensions/permissions/bluetooth_device_permission.h',
         'common/extensions/permissions/bluetooth_device_permission_data.cc',
         'common/extensions/permissions/bluetooth_device_permission_data.h',
         'common/extensions/permissions/media_galleries_permission.cc',
         'common/extensions/permissions/media_galleries_permission.h',
@@ skipping 456 matching lines @@
         'common/metrics/proto/user_action_event.proto',
       ],
       'variables': {
         'proto_in_dir': 'common/metrics/proto',
         'proto_out_dir': 'chrome/common/metrics/proto',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }