Enable the Synced Notification Flag on architectures other than Windows.

It still defaults to "off". This will enable the user to see synced
notifications on Mac and Linux and Chrome OS.

BUG=242652

Review URL: https://chromiumcodereview.appspot.com/15305016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@201985 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/about_flags.cc

@@ -1308,7 +1308,7 @@ const Experiment kExperiments[] = {
     "enable-sync-synced-notifications",
     IDS_FLAGS_ENABLE_SYNCED_NOTIFICATIONS_NAME,
     IDS_FLAGS_ENABLE_SYNCED_NOTIFICATIONS_DESCRIPTION,
-    kOsWin | kOsCrOS,
+    kOsDesktop,
     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSyncSyncedNotifications,
                               switches::kDisableSyncSyncedNotifications)
   },