Use mojo SystemTray interfaces for both mash and classic ash

ash/mus/system_tray_delegate_mus.h

Index: ash/mus/system_tray_delegate_mus.h
diff --git a/ash/mus/system_tray_delegate_mus.h b/ash/mus/system_tray_delegate_mus.h
index e4dc6efe2b0ba7774890ca0e421affd23fb4f69d..c6768705296d2b5a8ba708b3f19dd6949234e992 100644
--- a/ash/mus/system_tray_delegate_mus.h
+++ b/ash/mus/system_tray_delegate_mus.h
@@ -8,74 +8,29 @@
 #include <memory>
 
 #include "ash/common/system/tray/default_system_tray_delegate.h"
-#include "ash/public/interfaces/system_tray.mojom.h"
-#include "base/i18n/time_formatting.h"
 #include "base/macros.h"
 
-namespace shell {
-class Connector;
-}
-
 namespace ash {
 
 class NetworkingConfigDelegate;
 class VPNDelegate;
 
-// Handles the settings displayed in the system tray menu. For mus most settings
-// are obtained from chrome browser via mojo IPC. For the classic ash version
-// see SystemTrayDelegateChromeOS.
+// Handles the settings displayed in the system tray menu. For the classic ash
+// version see SystemTrayDelegateChromeOS.
 //
 // Chrome OS only. Other platforms use DefaultSystemTrayDelegate directly.
 //
 // TODO: Support all methods in SystemTrayDelegate. http://crbug.com/647412.
-class SystemTrayDelegateMus : public DefaultSystemTrayDelegate,
-                              public mojom::SystemTray {
+class SystemTrayDelegateMus : public DefaultSystemTrayDelegate {
  public:
-  explicit SystemTrayDelegateMus(shell::Connector* connector);
+  SystemTrayDelegateMus();
   ~SystemTrayDelegateMus() override;
 
-  static SystemTrayDelegateMus* Get();
-
  private:
-  // Connects or reconnects to the mojom::SystemTrayClient interface and returns
-  // the interface pointer.
-  mojom::SystemTrayClient* ConnectToSystemTrayClient();
-
-  // Handles errors on the |system_tray_client_| interface connection.
-  void OnClientConnectionError();
-
   // SystemTrayDelegate:
-  base::HourClockType GetHourClockType() const override;
-  void ShowSettings() override;
-  void ShowDateSettings() override;
-  void ShowNetworkSettingsForGuid(const std::string& guid) override;
-  void ShowDisplaySettings() override;
-  void ShowPowerSettings() override;
-  void ShowChromeSlow() override;
-  void ShowIMESettings() override;
-  void ShowHelp() override;
-  void ShowAccessibilityHelp() override;
-  void ShowAccessibilitySettings() override;
-  void ShowPaletteHelp() override;
-  void ShowPaletteSettings() override;
-  void ShowPublicAccountInfo() override;
-  void ShowEnterpriseInfo() override;
-  void ShowProxySettings() override;
   NetworkingConfigDelegate* GetNetworkingConfigDelegate() const override;
   VPNDelegate* GetVPNDelegate() const override;
 
-  // mojom::SystemTray:
-  void SetUse24HourClock(bool use_24_hour) override;
-
-  // May be null in unit tests.
-  shell::Connector* connector_;
-
-  // Client interface in chrome browser.
-  mojom::SystemTrayClientPtr system_tray_client_;
-
-  // 12 or 24 hour display.
-  base::HourClockType hour_clock_type_;
-
   std::unique_ptr<NetworkingConfigDelegate> networking_config_delegate_;
   std::unique_ptr<VPNDelegate> vpn_delegate_;