Old and new about pages: simplify product logo animation code

chrome/browser/resources/settings/about_page/compiled_resources2.gyp

 # Copyright 2016 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': 'about_page',
       'dependencies': [
         'about_page_browser_proxy',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:assert',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:i18n_behavior',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:parse_html_subset',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:web_ui_listener_behavior',
         '../compiled_resources2.gyp:lifetime_browser_proxy',
         '../compiled_resources2.gyp:route',
         '../settings_page/compiled_resources2.gyp:main_page_behavior',
         '../settings_page/compiled_resources2.gyp:settings_animated_pages',
+        '<(EXTERNS_GYP):web_animations',
       ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'about_page_browser_proxy',
       'dependencies': [
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
         '<(EXTERNS_GYP):chrome_send',
       ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'detailed_build_info',
       'dependencies': [
         'about_page_browser_proxy',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:i18n_behavior',
       ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
   ],
 }