Fixed crash related to cellular network payment plan retreival.

BUG=chromium-os:8864
TEST=none

Review URL: http://codereview.chromium.org/4690002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@65405 0039d316-1c4b-4281-b951-d872f2087c98
  void NotifyNetworkManagerChanged() {
    FOR_EACH_OBSERVER(NetworkManagerObserver,
                      network_manager_observers_,
                      OnNetworkManagerChanged(this));
  }

  void NotifyNetworkManagerChanged() {
    FOR_EACH_OBSERVER(NetworkManagerObserver,
                      network_manager_observers_,
                      OnNetworkManagerChanged(this));
  }
