Exclude PluginService for builds with enable_plugins==0

chrome/chrome_tests_unit.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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 1808 matching lines @@
           'sources/': [
             ['exclude', '^browser/safe_browsing/'],
             ['exclude', '^renderer/safe_browsing/'],
           ],
         }],
         ['enable_automation!=1', {
           'sources/': [
             ['exclude', '^browser/automation/'],
           ],
         }],
+        ['enable_plugins==0', {
+          'sources!': [
+            'browser/renderer_host/plugin_info_message_filter_unittest.cc',
+            'browser/plugins/plugin_prefs_unittest.cc',
+          ],
+        }],
         ['enable_printing!=1', {
           'sources/': [
             ['exclude', '^browser/printing/'],
             ['exclude', '^browser/ui/webui/print_preview/'],
           ],
         }],
         ['enable_captive_portal_detection!=1', {
           'sources/': [
             ['exclude', '^browser/captive_portal/'],
           ],
@@ skipping 466 matching lines @@
             'unit_tests.isolate',
           ],
           'sources': [
             'unit_tests.isolate',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }