MAGETWO-39289: Estimate Shipping and Tax is affects first checkout step(summary bock)

Author: Olexii Korshenko

app/code/Magento/Checkout/view/frontend/web/js/model/step-navigator.js

@@ -39,20 +39,10 @@ define(
                 return activeIndex;
             },
 
-            isAvailable: function(code) {
-                var flag = false;
-                this.stepCodes.forEach(function(element){
-                    if (element == code) {
-                        flag = true;
-                    }
-                });
-                return flag;
-            },
-
             isProcessed: function(code) {
                 var activeItemIndex = this.getActiveItemIndex();
                 var sortedItems = steps.sort(this.sortItems);
-                var requestedItemIndex = 0;
+                var requestedItemIndex = -1;
                 sortedItems.forEach(function(element, index) {
                     if (element.code == code) {
                         requestedItemIndex = index;
@@ -62,9 +52,7 @@ define(
             },
 
             navigateTo: function(step) {
-                var activeItemIndex = this.getActiveItemIndex();
                 var sortedItems = steps.sort(this.sortItems);
-                var stepIndex = sortedItems.indexOf(step);
                 if (!this.isProcessed(step.code)) {
                     return;
                 }

app/code/Magento/Checkout/view/frontend/web/js/view/summary/abstract-total.js

@@ -14,25 +14,17 @@ define(
     function (Component, quote, priceUtils, totals, stepNavigator) {
         "use strict";
         return Component.extend({
-            shippingAvailableFlag: undefined,
             getFormattedPrice: function (price) {
                 return priceUtils.formatPrice(price, quote.getPriceFormat());
             },
             getTotals: function() {
                 return totals.totals();
             },
-            isShippingAvailable: function() {
-                if (undefined !== this.shippingAvailableFlag) {
-                    return this.shippingAvailableFlag;
-                }
-                this.shippingAvailableFlag = stepNavigator.isAvailable('shipping');
-                return this.shippingAvailableFlag;
-            },
             isFullMode: function() {
                 if (!this.getTotals()) {
                     return false;
                 }
-                return !this.isShippingAvailable() || stepNavigator.isProcessed('shipping');
+                return stepNavigator.isProcessed('shipping');
             }
         });
     }