Revert "[Autofill Offer] Update offer text to "cashback""

This reverts commit 7ba7ed5e.

Reason for revert:  Breaks translation, crbug.com/1135333

Original change's description:
> [Autofill Offer] Update offer text to "cashback"
>
> Bug: 1112095
> Change-Id: I614ec70d4ba183850cd19412c963bd344b7c318c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444800
> Commit-Queue: Siyu An <siyua@chromium.org>
> Reviewed-by: Jared Saul <jsaul@google.com>
> Cr-Commit-Position: refs/heads/master@{#813422}

TBR=jsaul@google.com,siyua@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1112095
Change-Id: I998f30b7c76cca3e933a64168bbc796248946a40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451378Reviewed-by: Krishna Govind <govind@chromium.org>
Commit-Queue: Krishna Govind <govind@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814000}

components/autofill/core/browser/payments/autofill_offer_manager.cc

@@ -62,9 +62,14 @@ void AutofillOfferManager::UpdateSuggestionsWithOffers(
   for (auto& suggestion : suggestions) {
     std::string id = suggestion.backend_id;
     if (eligible_offers_map.count(id)) {
-      suggestion.offer_label = l10n_util::GetStringFUTF16(
-          IDS_AUTOFILL_OFFERS_CASHBACK,
-          base::UTF8ToUTF16(eligible_offers_map[id]->offer_reward_amount));
+      base::string16 reward_amount =
+          base::UTF8ToUTF16(eligible_offers_map[id]->offer_reward_amount);
+
+      auto string_id = (reward_amount.find('%') == std::string::npos)
+                           ? IDS_AUTOFILL_OFFERS_DISCOUNT
+                           : IDS_AUTOFILL_OFFERS_CASHBACK;
+      suggestion.offer_label =
+          l10n_util::GetStringFUTF16(string_id, reward_amount);
     }
   }
 }

components/autofill/core/browser/payments/autofill_offer_manager_unittest.cc

@@ -96,7 +96,7 @@ TEST_F(AutofillOfferManagerTest, UpdateSuggestionsWithOffers_EligibleDiscount) {
   autofill_offer_manager_->UpdateSuggestionsWithOffers(GURL(kTestUrlWithParam),
                                                        suggestions);
 
-  EXPECT_EQ(suggestions[0].offer_label, base::UTF8ToUTF16("$4 cashback"));
+  EXPECT_EQ(suggestions[0].offer_label, base::UTF8ToUTF16("$4 Off"));
 }
 
 TEST_F(AutofillOfferManagerTest, UpdateSuggestionsWithOffers_EligibleCashback) {
@@ -108,7 +108,7 @@ TEST_F(AutofillOfferManagerTest, UpdateSuggestionsWithOffers_EligibleCashback) {
   autofill_offer_manager_->UpdateSuggestionsWithOffers(GURL(kTestUrlWithParam),
                                                        suggestions);
 
-  EXPECT_EQ(suggestions[0].offer_label, base::UTF8ToUTF16("5% cashback"));
+  EXPECT_EQ(suggestions[0].offer_label, base::UTF8ToUTF16("5% Cash Back"));
 }
 
 TEST_F(AutofillOfferManagerTest, UpdateSuggestionsWithOffers_ExpiredOffer) {

components/autofill_payments_strings.grdp

@@ -507,6 +507,10 @@
 
   <!-- Credit card offers and rewards related strings -->
   <message name="IDS_AUTOFILL_OFFERS_CASHBACK" desc="Displays that a cashback offer will be rewarded if credit card is used on current page. Part of Autofill suggestions popup.">
-    <ph name="REWARD_VALUE">$1<ex>5%</ex></ph> cashback
+    <ph name="PERCENT">$1<ex>5%</ex></ph> Cash Back
   </message>
+  <message name="IDS_AUTOFILL_OFFERS_DISCOUNT" desc="Displays a discount that will be rewarded if credit card is used on current page. Part of Autofill suggestions popup.">
+    <ph name="DISCOUNT">$1<ex>$$3</ex></ph> Off
+  </message>
+
 </grit-part>

components/autofill_payments_strings_grdp/IDS_AUTOFILL_OFFERS_CASHBACK.png.sha1

-c4d8bc532aa3a5146c9d639d56c364ddb1a3db14
+378244426ac8f525d17518614e3d7b1508061cf9
\ No newline at end of file

components/autofill_payments_strings_grdp/IDS_AUTOFILL_OFFERS_DISCOUNT.png.sha1

+a09ae4c895b292cf8ce625cf9843a477d86dfc35
\ No newline at end of file