If Chrome Binaries version > App Host version, then update App Host.

chrome/chrome.gyp

 # 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': {
     'chromium_code': 1,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
       'version_path': 'VERSION',
@@ skipping 855 matching lines @@
         },
         {
           'target_name': 'chrome_version_resources',
           'type': 'none',
           'direct_dependent_settings': {
             'include_dirs': [
               '<(SHARED_INTERMEDIATE_DIR)/chrome_version',
             ],
           },
           'sources': [
+            'app/app_host_exe.ver',
             'app/chrome_exe.ver',
             'app/chrome_dll.ver',
             'app/nacl64_exe.ver',
             'app/other.ver',
           ],
           'rules': [
             {
               'rule_name': 'version',
               'extension': 'ver',
               'variables': {
@@ skipping 205 matching lines @@
           'variables': {
             'package_name': 'chrome',
             'java_in_dir': '../chrome/android/java',
           },
           'includes': [ '../build/java.gypi' ],
         },
       ]}, # 'targets'
     ],  # OS=="android"
   ],  # 'conditions'
 }