Use DownloadManager to initiate downloads from PluginInstaller.

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 1114 matching lines @@
         'browser/parsers/metadata_parser_filebase_unittest.cc',
         'browser/password_manager/chrome_password_manager_client_unittest.cc',
         'browser/password_manager/native_backend_gnome_x_unittest.cc',
         'browser/password_manager/native_backend_kwallet_x_unittest.cc',
         'browser/password_manager/password_manager_metrics_util_unittest.cc',
         'browser/password_manager/password_store_mac_unittest.cc',
         'browser/password_manager/password_store_win_unittest.cc',
         'browser/password_manager/password_store_x_unittest.cc',
         'browser/performance_monitor/database_unittest.cc',
         'browser/plugins/plugin_finder_unittest.cc',
+        'browser/plugins/plugin_installer_unittest.cc',
         'browser/plugins/plugin_metadata_unittest.cc',
         'browser/plugins/plugin_prefs_unittest.cc',
         'browser/policy/cloud/cloud_policy_invalidator_unittest.cc',
         'browser/policy/cloud/user_policy_signin_service_unittest.cc',
         'browser/policy/file_selection_dialogs_policy_handler_unittest.cc',
         'browser/policy/javascript_policy_handler_unittest.cc',
         'browser/policy/policy_path_parser_unittest.cc',
         'browser/policy/url_blacklist_manager_unittest.cc',
         'browser/predictors/autocomplete_action_predictor_table_unittest.cc',
         'browser/predictors/autocomplete_action_predictor_unittest.cc',
@@ skipping 1526 matching lines @@
         ['use_ozone==1', {
           'sources!': [
             # crbug.com/362698
             'browser/chromeos/input_method/input_method_engine_unittest.cc',
             'browser/chromeos/input_method/input_method_manager_impl_unittest.cc',
           ],
           'sources/': [
             ['exclude', '^browser/chromeos/events/'],  # crbug.com/354036
           ],
         }],
+        ['enable_plugin_installation==0', {
+          'sources!': [
+            'browser/plugins/plugin_installer_unittest.cc',
+          ],
+        }],
       ],
     },
     {
       'target_name': 'chrome_app_unittests',
       'type': 'executable',
       'dependencies': [
         # unit tests should only depend on
         # 1) everything that the chrome binaries depend on:
         '<@(chromium_browser_dependencies)',
         '<@(chromium_child_dependencies)',
@@ skipping 148 matching lines @@
             'browser/ui/app_list/test/fake_profile_store.h',
             'browser/ui/app_list/test/fast_show_pickler_unittest.cc',
             'browser/ui/views/app_list/linux/app_list_linux_unittest.cc',
             'browser/ui/views/app_list/win/app_list_win_unittest.cc',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }