Add a Create method to DesktopNotificationHandler and stubs for the notification objects.

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index 497e83ca3b93eed4ceef0dbf225d5cce2a716972..12d91ca041357a7fd90c67743979889c7d54bbb3 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -1445,11 +1445,6 @@
         'browser/net/sqlite_persistent_cookie_store_unittest.cc',
         'browser/net/url_fixer_upper_unittest.cc',
         'browser/net/url_info_unittest.cc',
-        'browser/notifications/desktop_notification_service_unittest.cc',
-        'browser/notifications/desktop_notifications_unittest.cc',
-        'browser/notifications/desktop_notifications_unittest.h',
-        'browser/notifications/notification_exceptions_table_model_unittest.cc',
-        'browser/notifications/notifications_prefs_cache_unittest.cc',
         'browser/parsers/metadata_parser_filebase_unittest.cc',
         'browser/password_manager/encryptor_password_mac_unittest.cc',
         'browser/password_manager/encryptor_unittest.cc',
@@ -1976,6 +1971,15 @@
         '../webkit/fileapi/file_system_test_helper.h',
       ],
       'conditions': [
+        ['enable_desktop_notifications==1', {
+          'sources': [
+            'browser/notifications/desktop_notification_service_unittest.cc',
+            'browser/notifications/desktop_notifications_unittest.cc',
+            'browser/notifications/desktop_notifications_unittest.h',
+            'browser/notifications/notification_exceptions_table_model_unittest.cc',
+            'browser/notifications/notifications_prefs_cache_unittest.cc',
+          ]
+        }],
         ['p2p_apis==1', {
           'sources': [
             '../content/browser/renderer_host/p2p/socket_host_test_utils.h',
@@ -2638,6 +2642,11 @@
             '../webkit/webkit.gyp:copy_npapi_test_plugin',
           ],
         }],
+        ['enable_desktop_notifications==1', {
+          'sources': [
+            'browser/task_manager/task_manager_notification_browsertest.cc',
+          ]
+        }],
       ],  # conditions
     },  # target browser_tests
     {