chromeos: Refactor system tray "show settings" commands to use mojo

chrome/browser/ui/ash/system_tray_delegate_chromeos.h

Index: chrome/browser/ui/ash/system_tray_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
index 5d861ddb0c6a12ba30be0b9e1d8b1ff1a326f4ca..600a4cf24e9c6d99d7cd8fa1c2c6ebfb402b5f11 100644
--- a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
+++ b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
@@ -89,21 +89,10 @@ class SystemTrayDelegateChromeOS
   bool IsUserSupervised() const override;
   bool IsUserChild() const override;
   void GetSystemUpdateInfo(ash::UpdateInfo* info) const override;
-  void ShowSettings() override;
   bool ShouldShowSettings() override;
   void ShowSetTimeDialog() override;
   void ShowNetworkSettingsForGuid(const std::string& guid) override;
-  void ShowDisplaySettings() override;
-  void ShowPowerSettings() override;
-  void ShowChromeSlow() override;
   bool ShouldShowDisplayNotification() 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 ShowUserLogin() override;
   void SignOut() override;
@@ -125,7 +114,6 @@ class SystemTrayDelegateChromeOS
   bool GetBluetoothAvailable() override;
   bool GetBluetoothEnabled() override;
   bool GetBluetoothDiscovering() override;
-  void ShowProxySettings() override;
   ash::CastConfigDelegate* GetCastConfigDelegate() override;
   ash::NetworkingConfigDelegate* GetNetworkingConfigDelegate() const override;
   ash::VolumeControlDelegate* GetVolumeControlDelegate() const override;