Removed support for IE 10 and Safari 8

spec/helpers/checkForMap.js

@@ -1,50 +1,5 @@
 /* eslint-disable compat/compat */
 (function(env) {
-  env.hasFunctioningMaps = function() {
-    if (typeof Map === 'undefined') {
-      return false;
-    }
-
-    try {
-      var s = new Map();
-      s.set('a', 1);
-      s.set('b', 2);
-
-      if (s.size !== 2) {
-        return false;
-      }
-      if (s.has('a') !== true) {
-        return false;
-      }
-
-      var iterations = 0;
-      var ifForEachWorking = true;
-      s.forEach(function(value, key, map) {
-        ifForEachWorking = ifForEachWorking && map === s;
-        if (key === 'a') {
-          ifForEachWorking = ifForEachWorking && value === 1;
-        }
-        iterations++;
-      });
-      if (iterations !== 2) {
-        return false;
-      }
-      if (ifForEachWorking !== true) {
-        return false;
-      }
-
-      return true;
-    } catch (e) {
-      return false;
-    }
-  };
-
-  env.requireFunctioningMaps = function() {
-    if (!env.hasFunctioningMaps()) {
-      env.pending('Browser has incomplete or missing support for Maps');
-    }
-  };
-
   env.requireWeakMaps = function() {
     if (typeof WeakMap === 'undefined') {
       env.pending('Browser does not have support for WeakMap');