[WebPayments] Extracting common code from Shipping + Contact Info views.

chrome/browser/ui/views/payments/payment_method_view_controller.cc

Index: chrome/browser/ui/views/payments/payment_method_view_controller.cc
diff --git a/chrome/browser/ui/views/payments/payment_method_view_controller.cc b/chrome/browser/ui/views/payments/payment_method_view_controller.cc
index d7a9b8684238989257bce29ade1162a3b259ff3b..8e66356a57efe319b56fb770dead08b2e3503dd7 100644
--- a/chrome/browser/ui/views/payments/payment_method_view_controller.cc
+++ b/chrome/browser/ui/views/payments/payment_method_view_controller.cc
@@ -40,8 +40,7 @@ enum class PaymentMethodViewControllerTags : int {
   ADD_CREDIT_CARD_BUTTON = kFirstTagValue,
 };
 
-class PaymentMethodListItem : public payments::PaymentRequestItemList::Item,
-                              public views::ButtonListener {
+class PaymentMethodListItem : public payments::PaymentRequestItemList::Item {
  public:
   // Does not take ownership of |card|, which  should not be null and should
   // outlive this object. |list| is the PaymentRequestItemList object that will