ash: Fix right-alignment of power-status text.

It turns out setting ALING_RIGHT on a Label isn't enough to get proper
right-aligned text. Label has to be explicitly told that it is multi-lined.

BUG=none
TEST=none

Review URL: https://chromiumcodereview.appspot.com/9918026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@129898 0039d316-1c4b-4281-b951-d872f2087c98
  void UpdatePowerStatus(const PowerSupplyStatus& status) {
    supply_status_ = status;
    if (supply_status_.battery_is_full)
      supply_status_.battery_percentage = 100.0;

    UpdateText();
  }

  void UpdatePowerStatus(const PowerSupplyStatus& status) {
    supply_status_ = status;
    if (supply_status_.battery_is_full)
      supply_status_.battery_percentage = 100.0;

    UpdateText();
  }
