Fix for conditional expressions

test/codegen/expect/dart/_internal.js

 var _internal;
 (function(exports) {
   'use strict';
   let POWERS_OF_TEN = /* Unimplemented const */new List.from([1.0, 10.0, 100.0, 1000.0, 10000.0, 100000.0, 1000000.0, 10000000.0, 100000000.0, 1000000000.0, 10000000000.0, 100000000000.0, 1000000000000.0, 10000000000000.0, 100000000000000.0, 1000000000000000.0, 10000000000000000.0, 100000000000000000.0, 1000000000000000000.0, 10000000000000000000.0, 100000000000000000000.0, 1e+21, 1e+22]);
   class EfficientLength extends dart.Object {
   }
   let ListIterable$ = dart.generic(function(E) {
     class ListIterable extends collection.IterableBase$(E) {
       ListIterable() {
         super.IterableBase();
@@ skipping 1352 matching lines @@
       return index;
     }
   }
   let _values = Symbol('_values');
   let ListMapView$ = dart.generic(function(E) {
     class ListMapView extends dart.Object {
       ListMapView($_values) {
         this[_values] = $_values;
       }
       get(key) {
-        return dart.as(this.containsKey(key) ? this[_values].get(key) : null, E);
+        return this.containsKey(key) ? this[_values].get(key) : null;
       }
       get length() {
         return this[_values].length;
       }
       get values() {
         return new SubListIterable(this[_values], 0, null);
       }
       get keys() {
         return new _ListIndicesIterable(this[_values]);
       }
@@ skipping 500 matching lines @@
   exports.ReversedListIterable = ReversedListIterable;
   exports.ReversedListIterable$ = ReversedListIterable$;
   exports.UnmodifiableListError = UnmodifiableListError;
   exports.NonGrowableListError = NonGrowableListError;
   exports.makeListFixedLength = makeListFixedLength;
   exports.Lists = Lists;
   exports.printToConsole = printToConsole;
   exports.Sort = Sort;
   exports.Symbol = Symbol;
 })(_internal || (_internal = {}));