cros: Move TrayBluetoothHelper out of chrome into ash

ash/common/system/tray/system_tray_controller.cc

Index: ash/common/system/tray/system_tray_controller.cc
diff --git a/ash/common/system/tray/system_tray_controller.cc b/ash/common/system/tray/system_tray_controller.cc
index c62dc0765ec5ebf0dd8ab546aa03f69d1a575ca4..547ac9943c3ae7afb074562f54913e3331af1f4c 100644
--- a/ash/common/system/tray/system_tray_controller.cc
+++ b/ash/common/system/tray/system_tray_controller.cc
@@ -28,6 +28,17 @@ void SystemTrayController::ShowBluetoothSettings() {
     system_tray_client_->ShowBluetoothSettings();
 }
 
+void SystemTrayController::ShowBluetoothPairingDialog(
+    const std::string& address,
+    const base::string16& name_for_display,
+    bool paired,
+    bool connected) {
+  if (system_tray_client_) {
+    system_tray_client_->ShowBluetoothPairingDialog(address, name_for_display,
+                                                    paired, connected);
+  }
+}
+
 void SystemTrayController::ShowDateSettings() {
   if (system_tray_client_)
     system_tray_client_->ShowDateSettings();