Turn on SyncedNotifications for Dev, Canary, and Unknown channel

Turning it on in Dev and Canary will allow us to gather feedback during the development process.

BUG=22205


Review URL: https://chromiumcodereview.appspot.com/12617010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@190089 0039d316-1c4b-4281-b951-d872f2087c98
   static std::vector<syncer::ModelType> DefaultDatatypes() {
    chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
     std::vector<syncer::ModelType> datatypes;
     datatypes.push_back(syncer::APPS);
     datatypes.push_back(syncer::APP_SETTINGS);
    datatypes.push_back(syncer::AUTOFILL);
    datatypes.push_back(syncer::AUTOFILL_PROFILE);
    datatypes.push_back(syncer::BOOKMARKS);
#if defined(OS_LINUX) || defined(OS_WIN) || defined(OS_CHROMEOS)
    datatypes.push_back(syncer::DICTIONARY);
#endif
    datatypes.push_back(syncer::EXTENSIONS);
    datatypes.push_back(syncer::EXTENSION_SETTINGS);
    datatypes.push_back(syncer::PASSWORDS);
     datatypes.push_back(syncer::PREFERENCES);
     datatypes.push_back(syncer::SEARCH_ENGINES);
     datatypes.push_back(syncer::SESSIONS);
    if (channel == chrome::VersionInfo::CHANNEL_UNKNOWN ||
        channel == chrome::VersionInfo::CHANNEL_DEV ||
        channel == chrome::VersionInfo::CHANNEL_CANARY) {
      datatypes.push_back(syncer::SYNCED_NOTIFICATIONS);
    }
     datatypes.push_back(syncer::PROXY_TABS);
     datatypes.push_back(syncer::THEMES);
     datatypes.push_back(syncer::TYPED_URLS);
    return datatypes;
  }

   static std::vector<syncer::ModelType> DefaultDatatypes() {
     std::vector<syncer::ModelType> datatypes;
     datatypes.push_back(syncer::APPS);
     datatypes.push_back(syncer::APP_SETTINGS);
    datatypes.push_back(syncer::AUTOFILL);
    datatypes.push_back(syncer::AUTOFILL_PROFILE);
    datatypes.push_back(syncer::BOOKMARKS);
#if defined(OS_LINUX) || defined(OS_WIN) || defined(OS_CHROMEOS)
    datatypes.push_back(syncer::DICTIONARY);
#endif
    datatypes.push_back(syncer::EXTENSIONS);
    datatypes.push_back(syncer::EXTENSION_SETTINGS);
    datatypes.push_back(syncer::PASSWORDS);
     datatypes.push_back(syncer::PREFERENCES);
     datatypes.push_back(syncer::SEARCH_ENGINES);
     datatypes.push_back(syncer::SESSIONS);
     datatypes.push_back(syncer::PROXY_TABS);
     datatypes.push_back(syncer::THEMES);
     datatypes.push_back(syncer::TYPED_URLS);
    return datatypes;
  }
