cros: Move TrayBluetoothHelper out of chrome into ash

ash/common/system/tray/system_tray_controller.h

Index: ash/common/system/tray/system_tray_controller.h
diff --git a/ash/common/system/tray/system_tray_controller.h b/ash/common/system/tray/system_tray_controller.h
index 59d6226bdb1e705952200d0fef3cf6d617535753..3af9387b6794f1b41fc7868d0d67f0d0f8fb2f51 100644
--- a/ash/common/system/tray/system_tray_controller.h
+++ b/ash/common/system/tray/system_tray_controller.h
@@ -34,7 +34,10 @@ class ASH_EXPORT SystemTrayController
   // Wrappers around the mojom::SystemTrayClient interface.
   void ShowSettings();
   void ShowBluetoothSettings();
-  // TODO(crbug.com/660043): ShowBluetoothPairingDialog() goes here.
+  void ShowBluetoothPairingDialog(const std::string& address,
+                                  const base::string16& name_for_display,
+                                  bool paired,
+                                  bool connected);
   void ShowDateSettings();
   void ShowSetTimeDialog();
   void ShowDisplaySettings();