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

components/payments/core/strings_util.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/payments/core/strings_util.h"
+
+#include "base/logging.h"
+#include "components/strings/grit/components_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+
+namespace payments {
+
+base::string16 GetShippingAddressSectionString(
+    PaymentShippingType shipping_type) {
+  switch (shipping_type) {
+    case PaymentShippingType::DELIVERY:
+      return l10n_util::GetStringUTF16(IDS_PAYMENTS_DELIVERY_ADDRESS_LABEL);
+    case PaymentShippingType::PICKUP:
+      return l10n_util::GetStringUTF16(IDS_PAYMENTS_PICKUP_ADDRESS_LABEL);
+    case PaymentShippingType::SHIPPING:
+      return l10n_util::GetStringUTF16(IDS_PAYMENTS_SHIPPING_ADDRESS_LABEL);
+    default:
+      NOTREACHED();
+      return base::string16();
+  }
+}
+
+base::string16 GetShippingOptionSectionString(
+    PaymentShippingType shipping_type) {
+  switch (shipping_type) {
+    case PaymentShippingType::DELIVERY:
+      return l10n_util::GetStringUTF16(IDS_PAYMENTS_DELIVERY_OPTION_LABEL);
+    case PaymentShippingType::PICKUP:
+      return l10n_util::GetStringUTF16(IDS_PAYMENTS_PICKUP_OPTION_LABEL);
+    case PaymentShippingType::SHIPPING:
+      return l10n_util::GetStringUTF16(IDS_PAYMENTS_SHIPPING_OPTION_LABEL);
+    default:
+      NOTREACHED();
+      return base::string16();
+  }
+}
+
+}  // namespace payments