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

ash/common/system/tray/system_tray_delegate.h

Index: ash/common/system/tray/system_tray_delegate.h
diff --git a/ash/common/system/tray/system_tray_delegate.h b/ash/common/system/tray/system_tray_delegate.h
index df316aeb96764816c4f31c0f49f4cf1be5579f60..9751f556c87aad3189b0608e4871c6068633213f 100644
--- a/ash/common/system/tray/system_tray_delegate.h
+++ b/ash/common/system/tray/system_tray_delegate.h
@@ -144,9 +144,6 @@ class ASH_EXPORT SystemTrayDelegate {
   // Fills |info| structure (which must not be null) with current update info.
   virtual void GetSystemUpdateInfo(UpdateInfo* info) const;
 
-  // Shows settings.
-  virtual void ShowSettings();
-
   // Returns true if settings menu item should appear.
   virtual bool ShouldShowSettings();
 
@@ -157,40 +154,10 @@ class ASH_EXPORT SystemTrayDelegate {
   // show the settings for the corresponding network.
   virtual void ShowNetworkSettingsForGuid(const std::string& guid);
 
-  // Shows settings related to multiple displays.
-  virtual void ShowDisplaySettings();
-
-  // Shows settings related to power.
-  virtual void ShowPowerSettings();
-
-  // Shows the page that lets you disable performance tracing.
-  virtual void ShowChromeSlow();
-
   // Returns true if the notification for the display configuration change
   // should appear.
   virtual bool ShouldShowDisplayNotification();
 
-  // Shows settings related to input methods.
-  virtual void ShowIMESettings();
-
-  // Shows help.
-  virtual void ShowHelp();
-
-  // Show accessilibity help.
-  virtual void ShowAccessibilityHelp();
-
-  // Show the settings related to accessilibity.
-  virtual void ShowAccessibilitySettings();
-
-  // Shows the help center article for palette.
-  virtual void ShowPaletteHelp();
-
-  // Shows the settings related to the palette.
-  virtual void ShowPaletteSettings();
-
-  // Shows more information about public account mode.
-  virtual void ShowPublicAccountInfo();
-
   // Shows information about enterprise enrolled devices.
   virtual void ShowEnterpriseInfo();
 
@@ -255,9 +222,6 @@ class ASH_EXPORT SystemTrayDelegate {
   // Returns whether the delegate has initiated a bluetooth discovery session.
   virtual bool GetBluetoothDiscovering();
 
-  // Shows UI for changing proxy settings.
-  virtual void ShowProxySettings();
-
   // Returns CastConfigDelegate. May return nullptr.
   virtual CastConfigDelegate* GetCastConfigDelegate();