Remove any unnecessary parens around expressions in interpolations.

pkg/analyzer/test/generated/test_support.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.test_support;
 
 import 'dart:collection';
@@ skipping 303 matching lines @@
    *
    * @param expectedClass the class that the object is expected to be an instance of
    * @param object the object being tested
    * @return the object that was being tested
    * @throws Exception if the object is not an instance of the expected class
    */
   static Object assertInstanceOf(Predicate<Object> predicate,
       Type expectedClass, Object object) {
     if (!predicate(object)) {
       JUnitTestCase.fail(
-          "Expected instance of $expectedClass, found ${(object == null ? "null" : object.runtimeType)}");
+          "Expected instance of $expectedClass, found ${object == null ? "null" : object.runtimeType}");
     }
     return object;
   }
 
   /**
    * Assert that the given array is non-`null` and has the expected number of elements.
    *
    * @param expectedLength the expected number of elements
    * @param array the array being tested
    * @throws AssertionFailedError if the array is `null` or does not have the expected number
@@ skipping 656 matching lines @@
   void getContentsToReceiver(Source_ContentReceiver receiver) {
     throw new UnsupportedOperationException();
   }
   Source resolve(String uri) {
     throw new UnsupportedOperationException();
   }
   Uri resolveRelativeUri(Uri uri) {
     return new Uri(scheme: 'file', path: _name).resolveUri(uri);
   }
 }