Refactor download image-MIME-type-detection code.

chrome/chrome_browser_chromeos.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.
 
 {
   'variables': {
     # These files lists are shared with the GN build.
     'browser_chromeos_sources': [
         # All .cc, .h, .m, and .mm files under browser/chromeos, except for tests
@@ skipping 753 matching lines @@
         'browser/chromeos/net/network_portal_web_dialog.cc',
         'browser/chromeos/net/network_portal_web_dialog.h',
         'browser/chromeos/net/onc_utils.cc',
         'browser/chromeos/net/onc_utils.h',
         'browser/chromeos/net/proxy_config_handler.cc',
         'browser/chromeos/net/proxy_config_handler.h',
         'browser/chromeos/net/wake_on_wifi_connection_observer.cc',
         'browser/chromeos/net/wake_on_wifi_connection_observer.h',
         'browser/chromeos/net/wake_on_wifi_manager.cc',
         'browser/chromeos/net/wake_on_wifi_manager.h',
+        'browser/chromeos/note_taking_app_utils.cc',
+        'browser/chromeos/note_taking_app_utils.h',
         'browser/chromeos/options/cert_library.cc',
         'browser/chromeos/options/cert_library.h',
         'browser/chromeos/options/network_config_view.cc',
         'browser/chromeos/options/network_config_view.h',
         'browser/chromeos/options/network_property_ui_data.cc',
         'browser/chromeos/options/network_property_ui_data.h',
         'browser/chromeos/options/passphrase_textfield.cc',
         'browser/chromeos/options/passphrase_textfield.h',
         'browser/chromeos/options/vpn_config_view.cc',
         'browser/chromeos/options/vpn_config_view.h',
@@ skipping 614 matching lines @@
         'browser/chromeos/attestation/attestation_signed_data.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/attestation',
         'proto_out_dir': 'chrome/browser/chromeos/attestation',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }