Change the field and constructor parameter types of NoSuchMethodError to Symbol.

sdk/lib/_internal/lib/interceptors.dart

 // Copyright (c) 2012, 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.
 
 library _interceptors;
 
 import 'dart:collection';
 import 'dart:_collection-dev' hide Symbol;
 import "dart:_collection-dev" as _symbol_dev show Symbol;
 import 'dart:_js_helper' show allMatchesInStringUnchecked,
@@ skipping 320 matching lines @@
 
   bool operator ==(other) => identical(this, other);
 
   int get hashCode => Primitives.objectHashCode(this);
 
   String toString() => Primitives.objectToString(this);
 
   dynamic noSuchMethod(Invocation invocation) {
     throw new NoSuchMethodError(
         this,
-        _symbolToString(invocation.memberName),
+        invocation.memberName,
         invocation.positionalArguments,
-        _symbolMapToStringMap(invocation.namedArguments));
+        invocation.namedArguments);
   }
 
   Type get runtimeType => getRuntimeType(this);
 }
 
 /**
  * The interceptor class for [bool].
  */
 class JSBool extends Interceptor implements bool {
   const JSBool();
@@ skipping 80 matching lines @@
 }
 
 
 /**
  * Interceptor for unclassified JavaScript objects, typically objects with a
  * non-trivial prototype chain.
  */
 class UnknownJavaScriptObject extends JavaScriptObject {
   const UnknownJavaScriptObject();
 }