Revert of PaymentHandler: Implement PaymentInstruments.keys().

third_party/WebKit/Source/modules/payments/PaymentInstruments.cpp

Index: third_party/WebKit/Source/modules/payments/PaymentInstruments.cpp
diff --git a/third_party/WebKit/Source/modules/payments/PaymentInstruments.cpp b/third_party/WebKit/Source/modules/payments/PaymentInstruments.cpp
index 746145fa308068cbf8cc372bbb85aaf110dcf8e8..829a852b2c9f100a3642c7bbcf2f0f4106675b28 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentInstruments.cpp
+++ b/third_party/WebKit/Source/modules/payments/PaymentInstruments.cpp
@@ -89,20 +89,9 @@
   return promise;
 }
 
-ScriptPromise PaymentInstruments::keys(ScriptState* script_state) {
-  if (!manager_.is_bound()) {
-    return ScriptPromise::RejectWithDOMException(
-        script_state,
-        DOMException::Create(kInvalidStateError, kPaymentManagerUnavailable));
-  }
-
-  ScriptPromiseResolver* resolver = ScriptPromiseResolver::Create(script_state);
-  ScriptPromise promise = resolver->Promise();
-
-  manager_->KeysOfPaymentInstruments(ConvertToBaseCallback(
-      WTF::Bind(&PaymentInstruments::onKeysOfPaymentInstruments,
-                WrapPersistent(this), WrapPersistent(resolver))));
-  return promise;
+ScriptPromise PaymentInstruments::keys() {
+  NOTIMPLEMENTED();
+  return ScriptPromise();
 }
 
 ScriptPromise PaymentInstruments::has(ScriptState* script_state,
@@ -208,16 +197,6 @@
   resolver->Resolve(instrument);
 }
 
-void PaymentInstruments::onKeysOfPaymentInstruments(
-    ScriptPromiseResolver* resolver,
-    const Vector<String>& keys,
-    payments::mojom::blink::PaymentHandlerStatus status) {
-  DCHECK(resolver);
-  if (rejectError(resolver, status))
-    return;
-  resolver->Resolve(keys);
-}
-
 void PaymentInstruments::onHasPaymentInstrument(
     ScriptPromiseResolver* resolver,
     payments::mojom::blink::PaymentHandlerStatus status) {