Add PluginInstaller to encapsulate information about a missing plug-in.

chrome/chrome_browser.gypi

 # Copyright (c) 2011 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': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1711 matching lines @@
         'browser/platform_util_common_linux.cc',
         'browser/platform_util_linux.cc',
         'browser/platform_util_mac.mm',
         'browser/platform_util_win.cc',
         'browser/plugin_data_remover_helper.cc',
         'browser/plugin_data_remover_helper.h',
         'browser/plugin_download_helper.cc',
         'browser/plugin_download_helper.h',
         'browser/plugin_finder.cc',
         'browser/plugin_finder.h',
+        'browser/plugin_installer.cc',
+        'browser/plugin_installer.h',
         'browser/plugin_installer_infobar_delegate.cc',
         'browser/plugin_installer_infobar_delegate.h',
         'browser/plugin_observer.cc',
         'browser/plugin_observer.h',
         'browser/plugin_prefs.cc',
         'browser/plugin_prefs.h',
         'browser/plugin_prefs_factory.cc',
         'browser/plugin_prefs_factory.h',
         'browser/policy/asynchronous_policy_loader.cc',
         'browser/policy/asynchronous_policy_loader.h',
@@ skipping 3506 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }