chromeos: Remove legacy code for chrome://imageburner

WATCHLISTS

 # 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.
 
 # Watchlist Rules
 # Refer: http://dev.chromium.org/developers/contributing-code/watchlists
 
 # IMPORTANT: The regular expression filepath is tested against each path using
 # re.search, so it is not usually necessary to add .*.
 
@@ skipping 362 matching lines @@
       'filepath': 'chrome/browser/extensions/api/hotword_private/'\
                   '|chrome/browser/resources/hotword_helper/'\
                   '|chrome/browser/resources/hotword/'\
                   '|chrome/browser/search/hotword*'\
                   '|chrome/test/data/extensions/api_test/hotword_private/',
     },
     'i18n': {
       'filepath': 'base/i18n/|base/string|l10n|icu|'\
         'locale_settings|encoding',
     },
-    'imageburner': {
-      'filepath': 'imageburner'
-    },
     'importer': {
       'filepath': 'import',
     },
     'indexed_db': {
       'filepath': 'content/browser/indexed_db|'\
                   'content/child/indexed_db|'\
                   'content/common/indexed_db|'\
                   'content/public/browser/indexed_db|'\
                   'content/test/data/indexeddb',
     },
@@ skipping 480 matching lines @@
     'ftp': ['phajdan.jr@chromium.org'],
     'gcm': ['zea+watch@chromium.org'],
     'geolocation': ['mvanouwerkerk@chromium.org'],
     'gfx_geometry': ['cc-bugs@chromium.org'],
     'gfx_image': ['rsesek+watch@chromium.org'],
     'gn': ['tfarina@chromium.org'],
     'gpu': ['piman+watch@chromium.org'],
     'history_ui': ['dubroy@chromium.org', 'pam+watch@chromium.org'],
     'hotword': ['rlp+watch@chromium.org'],
     'i18n': ['jshin+watch@chromium.org'],
-    'imageburner': ['tbarzic+watch@chromium.org'],
     'importer': ['tfarina@chromium.org'],
     'indexed_db': ['cmumford@chromium.org',
                    'dgrogan@chromium.org', 'jsbell+idb@chromium.org'],
     'installer': ['grt+watch@chromium.org', 'wfh+watch@chromium.org'],
     'instant': ['dcblack@chromium.org', 'jered@chromium.org',
                 'samarth+watch@chromium.org', 'donnd+watch@chromium.org',
                 'melevin+watch@chromium.org', 'dougw+watch@chromium.org',
                 'kmadhusu+watch@chromium.org', 'dhollowa+watch@chromium.org',
                 'jfweitz+watch@chromium.org', 'skanuj+watch@chromium.org'],
     'ipc': ['jam@chromium.org', 'darin-cc@chromium.org'],
@@ skipping 112 matching lines @@
                      'mcasas+watch@chromium.org',
                      'posciak+watch@chromium.org'],
     'website_settings': ['markusheintz@chromium.org'],
     'windows_sandboxing': ['wfh+watch@chromium.org'],
     'worker': ['jam@chromium.org'],
     'x11': ['derat+watch@chromium.org',
             'sadrul@chromium.org',
             'yusukes+watch@chromium.org'],
   },
 }