consumable: Correct width and height reported in response. (prebid#1459)

Prebid Server now responds with the width and height specified in
the Bid Response from Consumable. Previously it would reuse the width
and height specified in the Bid Request. That older behaviour was
ported from an older version of the prebid.js adapter but is no longer
valid.

adapters/consumable/consumable.go

@@ -69,6 +69,8 @@ type decision struct {
 	CreativeID    string     `json:"creativeId,omitempty"`
 	Contents      []contents `json:"contents"`
 	ImpressionUrl *string    `json:"impressionUrl,omitempty"`
+	Width         uint64     `json:"width,omitempty"`  // Consumable extension, not defined by Adzerk
+	Height        uint64     `json:"height,omitempty"` // Consumable extension, not defined by Adzerk
 }
 
 type contents struct {
@@ -241,23 +243,13 @@ func (a *ConsumableAdapter) MakeBids(
 	for impID, decision := range serverResponse.Decisions {
 
 		if decision.Pricing != nil && decision.Pricing.ClearPrice != nil {
-
-			imp := getImp(impID, internalRequest.Imp)
-			if imp == nil {
-				errors = append(errors, &errortypes.BadServerResponse{
-					Message: fmt.Sprintf(
-						"ignoring bid id=%s, request doesn't contain any impression with id=%s", internalRequest.ID, impID),
-				})
-				continue
-			}
-
 			bid := openrtb.Bid{}
 			bid.ID = internalRequest.ID
 			bid.ImpID = impID
 			bid.Price = *decision.Pricing.ClearPrice
 			bid.AdM = retrieveAd(decision)
-			bid.W = imp.Banner.Format[0].W // TODO: Review to check if this is correct behaviour
-			bid.H = imp.Banner.Format[0].H
+			bid.W = decision.Width
+			bid.H = decision.Height
 			bid.CrID = strconv.FormatInt(decision.AdID, 10)
 			bid.Exp = 30 // TODO: Check this is intention of TTL
 
@@ -279,15 +271,6 @@ func (a *ConsumableAdapter) MakeBids(
 	return bidderResponse, errors
 }
 
-func getImp(impId string, imps []openrtb.Imp) *openrtb.Imp {
-	for _, imp := range imps {
-		if imp.ID == impId {
-			return &imp
-		}
-	}
-	return nil
-}
-
 func extractExtensions(impression openrtb.Imp) (*adapters.ExtImpBidder, *openrtb_ext.ExtImpConsumable, []error) {
 	var bidderExt adapters.ExtImpBidder
 	if err := json.Unmarshal(impression.Ext, &bidderExt); err != nil {