Correct validation of shipping method input in resolver

Correlates to the schema changes made: magento/graphql-ce@fa5613b

Author: pmclain

app/code/Magento/QuoteGraphQl/Model/Resolver/SetShippingMethodsOnCart.php

@@ -72,10 +72,10 @@ public function resolve(Field $field, $context, ResolveInfo $info, array $value
         if (!$shippingMethod['cart_address_id']) {
             throw new GraphQlInputException(__('Required parameter "cart_address_id" is missing'));
         }
-        if (!$shippingMethod['shipping_carrier_code']) {
+        if (!$shippingMethod['carrier_code']) {
             throw new GraphQlInputException(__('Required parameter "shipping_carrier_code" is missing'));
         }
-        if (!$shippingMethod['shipping_method_code']) {
+        if (!$shippingMethod['method_code']) {
             throw new GraphQlInputException(__('Required parameter "shipping_method_code" is missing'));
         }
 
@@ -85,8 +85,8 @@ public function resolve(Field $field, $context, ResolveInfo $info, array $value
         $this->setShippingMethodOnCart->execute(
             $cart,
             $shippingMethod['cart_address_id'],
-            $shippingMethod['shipping_carrier_code'],
-            $shippingMethod['shipping_method_code']
+            $shippingMethod['carrier_code'],
+            $shippingMethod['method_code']
         );
 
         return [