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
ProfileSyncComponentsFactoryImpl::ProfileSyncComponentsFactoryImpl(
    Profile* profile, CommandLine* command_line)
    : profile_(profile),
      command_line_(command_line),
      extension_system_(
          extensions::ExtensionSystemFactory::GetForProfile(profile)),
      web_data_service_(WebDataService::FromBrowserContext(profile_)) {
}

ProfileSyncComponentsFactoryImpl::ProfileSyncComponentsFactoryImpl(
    Profile* profile, CommandLine* command_line)
    : profile_(profile),
      command_line_(command_line),
      extension_system_(
          extensions::ExtensionSystemFactory::GetForProfile(profile)),
      web_data_service_(WebDataService::FromBrowserContext(profile_)) {
}
