mustash: Connect ash system tray "show settings" items to chrome over mojo

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 b3845faaa65ff80d9614bbdb9e8ce11d79c03e13..89b6e60b3069ee678181070f624deb6843a3c60e 100644
--- a/ash/mus/system_tray_delegate_mus.h
+++ b/ash/mus/system_tray_delegate_mus.h
@@ -38,7 +38,21 @@ class SystemTrayDelegateMus : public DefaultSystemTrayDelegate,
 
   // 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;
 
   // mojom::SystemTray:
   void SetUse24HourClock(bool use_24_hour) override;