These methods need to be eliminated or converted to mojo:

  // Returns the currently selected IME.
  virtual void GetCurrentIME(IMEInfo* info);

  // Returns a list of availble IMEs.
  virtual void GetAvailableIMEList(IMEInfoList* list);

  // Returns a list of properties for the currently selected IME.
  virtual void GetCurrentIMEProperties(IMEPropertyInfoList* list);

  // Returns a non-empty string if IMEs are managed by policy.
  virtual base::string16 GetIMEManagedMessage();

  // Switches to the selected input method.
  virtual void SwitchIME(const std::string& ime_id);

  // Activates an IME property.
  virtual void ActivateIMEProperty(const std::string& key);

What's the current plan for IME in mustash? Separate app?