Spelling fixes e to i.

tests/compiler/dart2js/simple_inferrer_final_field2_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Test that a non-used generative constructor does not prevent
-// infering types for fields.
+// inferring types for fields.
 
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 
 import 'compiler_helper.dart';
 
 const String TEST = """
 
 class A {
   final intField;
@@ skipping 19 matching lines @@
           Expect.isTrue(
               typesInferrer.getTypeOfElement(element).containsOnly(type));
         }
 
         checkFieldTypeInClass('A', 'intField',
             typesInferrer.closedWorld.commonElements.jsUInt31Class);
         checkFieldTypeInClass('A', 'stringField',
             typesInferrer.closedWorld.commonElements.jsStringClass);
       }));
 }