Enable NPAPI if policy has plugin policies.

chrome/chrome_browser.gypi

 # Copyright 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 2096 matching lines @@
     ],
     # Policy sources used only on desktop OS's (CrOS not counted).
     'chrome_browser_policy_desktop_sources': [
       'browser/policy/cloud/user_policy_signin_service.cc',
       'browser/policy/cloud/user_policy_signin_service.h',
       'browser/sync/sync_global_error.cc',
       'browser/sync/sync_global_error.h',
       'browser/upgrade_detector_impl.cc',
       'browser/upgrade_detector_impl.h',
     ],
+    # Policy sources used if plugins are enabled.
+    'chrome_browser_policy_plugin_sources': [
+      'browser/plugins/plugin_policy_handler.cc',
+      'browser/plugins/plugin_policy_handler.h',
+    ],
     'chrome_browser_predictor_sources': [
       'browser/predictors/autocomplete_action_predictor.cc',
       'browser/predictors/autocomplete_action_predictor.h',
       'browser/predictors/autocomplete_action_predictor_factory.cc',
       'browser/predictors/autocomplete_action_predictor_factory.h',
       'browser/predictors/autocomplete_action_predictor_table.cc',
       'browser/predictors/autocomplete_action_predictor_table.h',
       'browser/predictors/logged_in_predictor_table.cc',
       'browser/predictors/logged_in_predictor_table.h',
       'browser/predictors/predictor_database.cc',
@@ skipping 1152 matching lines @@
               'sources': [ '<@(chrome_browser_policy_non_ios_sources)' ],
             }],
             ['chromeos==0', {
               'sources': [
                 '<@(chrome_browser_policy_shared_with_ios_not_chromeos_sources)',
               ],
             }],
             ['OS=="win" or OS=="mac" or desktop_linux==1', {
               'sources': [ '<@(chrome_browser_policy_desktop_sources)' ],
             }],
+            ['enable_plugins==1', {
+              'sources': [ '<@(chrome_browser_policy_plugin_sources)' ],
+            }],
             ['OS=="android" or OS=="ios"', {  # Mobile.
               'sources': [ '<@(chrome_browser_policy_mobile_sources)' ],
             }, {  # Non-mobile.
               'dependencies': [
                 'policy_path_parser',
               ],
             }],
           ],
         }, {  # configuration_policy==0
           'sources': [ '<@(chrome_browser_policy_disabled_sources)' ],
@@ skipping 530 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }