Revert "Add a function getTotalAmount() instead of relying on calculateTotalFee() that only exists in specific circumstances"

This reverts commit 999a7e5.

Author: eileenmcnaughton

Metadata/js/omnipay_PaypalRest.js

@@ -3,29 +3,6 @@
   var form = $('#billing-payment-block').closest('form');
   var qfKey = $('[name=qfKey]', form).val();
 
-  /**
-   * Get the total amount on the form
-   * @returns {number}
-   */
-  function getTotalAmount() {
-    var totalFee = 0.0;
-    if (typeof CRM.payment.getTotalAmount !== 'undefined') {
-      return CRM.payment.getTotalAmount();
-    }
-
-    if (typeof calculateTotalFee == 'function') {
-        // This is ONLY triggered in the following circumstances on a CiviCRM contribution page:
-        // - With a priceset that allows a 0 amount to be selected.
-        // - When we are the ONLY payment processor configured on the page.
-        totalFee = parseFloat(calculateTotalFee());
-    }
-    else if (document.getElementById('total_amount')) {
-      // The input#total_amount field exists on backend contribution forms
-      totalFee = parseFloat(document.getElementById('total_amount').value);
-    }
-    return totalFee;
-  }
-
   function renderPaypal() {
     paypal.Buttons({
 
@@ -53,7 +30,7 @@
 
           var frequencyInterval = $('#frequency_interval').val() || 1;
           var frequencyUnit = $('#frequency_unit').val() ? $('#frequency_interval').val() : CRM.vars.omnipay.frequency_unit;
-          var paymentAmount = getTotalAmount();
+          var paymentAmount = calculateTotalFee();
           var isRecur = $('#is_recur').is(":checked");
           var recurText = isRecur ? ' recurring' : '';