Revert of PaymentHandler: Implement PaymentInstruments.keys().

content/browser/payments/payment_app_database.h

Index: content/browser/payments/payment_app_database.h
diff --git a/content/browser/payments/payment_app_database.h b/content/browser/payments/payment_app_database.h
index 9219e0bfb71cbb0b9777ed96bf304a4891cd5b1b..2635d3877cf51485828331836d56f7470cefedb0 100644
--- a/content/browser/payments/payment_app_database.h
+++ b/content/browser/payments/payment_app_database.h
@@ -37,9 +37,6 @@
   using ReadPaymentInstrumentCallback =
       base::OnceCallback<void(payments::mojom::PaymentInstrumentPtr,
                               payments::mojom::PaymentHandlerStatus)>;
-  using KeysOfPaymentInstrumentsCallback =
-      base::OnceCallback<void(const std::vector<std::string>&,
-                              payments::mojom::PaymentHandlerStatus)>;
   using HasPaymentInstrumentCallback =
       base::OnceCallback<void(payments::mojom::PaymentHandlerStatus)>;
   using WritePaymentInstrumentCallback =
@@ -60,8 +57,6 @@
   void ReadPaymentInstrument(const GURL& scope,
                              const std::string& instrument_key,
                              ReadPaymentInstrumentCallback callback);
-  void KeysOfPaymentInstruments(const GURL& scope,
-                                KeysOfPaymentInstrumentsCallback callback);
   void HasPaymentInstrument(const GURL& scope,
                             const std::string& instrument_key,
                             HasPaymentInstrumentCallback callback);
@@ -119,15 +114,6 @@
                                 const std::vector<std::string>& data,
                                 ServiceWorkerStatusCode status);
 
-  // KeysOfPaymentInstruments callbacks
-  void DidFindRegistrationToGetKeys(
-      KeysOfPaymentInstrumentsCallback callback,
-      ServiceWorkerStatusCode status,
-      scoped_refptr<ServiceWorkerRegistration> registration);
-  void DidGetKeysOfPaymentInstruments(KeysOfPaymentInstrumentsCallback callback,
-                                      const std::vector<std::string>& data,
-                                      ServiceWorkerStatusCode status);
-
   // HasPaymentInstrument callbacks
   void DidFindRegistrationToHasPaymentInstrument(
       const std::string& instrument_key,