Enable canMakePayment() for web payments.

third_party/WebKit/Source/modules/payments/PaymentRequest.idl

Index: third_party/WebKit/Source/modules/payments/PaymentRequest.idl
diff --git a/third_party/WebKit/Source/modules/payments/PaymentRequest.idl b/third_party/WebKit/Source/modules/payments/PaymentRequest.idl
index da5b1d4bed24c311c6dffa6c1422138a1213ea64..943b325dde16a05e7514fb3e70429ce84f677553 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentRequest.idl
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequest.idl
@@ -15,6 +15,7 @@
 ] interface PaymentRequest : EventTarget {
     [CallWith=ScriptState] Promise<PaymentResponse> show();
     [CallWith=ScriptState] Promise<void> abort();
+    [CallWith=ScriptState, RuntimeEnabled=CanMakePayment] Promise<boolean> canMakePayment();
 
     [ImplementedAs=getShippingAddress] readonly attribute PaymentAddress? shippingAddress;
     readonly attribute DOMString? shippingOption;
@@ -22,7 +23,4 @@
 
     attribute EventHandler onshippingaddresschange;
     attribute EventHandler onshippingoptionchange;
-
-    // https://github.com/w3c/browser-payment-api/issues/310
-    [CallWith=ScriptState, RuntimeEnabled=CanMakePayment] Promise<boolean> canMakePayment();
 };