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
static NetworkRoamingState ParseRoamingState(
    const std::string& roaming_state) {
    if (roaming_state == kRoamingStateHome)
    return ROAMING_STATE_HOME;
  if (roaming_state == kRoamingStateRoaming)
    return ROAMING_STATE_ROAMING;
  if (roaming_state == kRoamingStateUnknown)
    return ROAMING_STATE_UNKNOWN;
  return ROAMING_STATE_UNKNOWN;
}

static NetworkRoamingState ParseRoamingState(
    const std::string& roaming_state) {
    if (roaming_state == kRoamingStateHome)
    return ROAMING_STATE_HOME;
  if (roaming_state == kRoamingStateRoaming)
    return ROAMING_STATE_ROAMING;
  if (roaming_state == kRoamingStateUnknown)
    return ROAMING_STATE_UNKNOWN;
  return ROAMING_STATE_UNKNOWN;
}
