Move string helper functions to components/core for iOS use.

chrome/browser/ui/views/payments/payment_request_views_util.h

Index: chrome/browser/ui/views/payments/payment_request_views_util.h
diff --git a/chrome/browser/ui/views/payments/payment_request_views_util.h b/chrome/browser/ui/views/payments/payment_request_views_util.h
index c00b10b261993e2aa203638b151b26f17b229c7d..189618aaa2840e0b2ada940cda9926f3454988d2 100644
--- a/chrome/browser/ui/views/payments/payment_request_views_util.h
+++ b/chrome/browser/ui/views/payments/payment_request_views_util.h
@@ -98,11 +98,6 @@ std::unique_ptr<views::Border> CreatePaymentRequestRowBorder();
 // Creates a label with a bold font.
 std::unique_ptr<views::Label> CreateBoldLabel(const base::string16& text);
 
-base::string16 GetShippingAddressSectionString(
-    PaymentShippingType shipping_type);
-base::string16 GetShippingOptionSectionString(
-    PaymentShippingType shipping_type);
-
 std::unique_ptr<views::View> CreateShippingOptionLabel(
     payments::mojom::PaymentShippingOption* shipping_option,
     const base::string16& formatted_amount);