Remove unused WrongArgumentCountException.

lib/core/exceptions.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.
 
 // Exceptions are thrown either by the VM or from Dart code.
 
 /**
  * Interface implemented by all core library exceptions.
  * Defaults to an implementation that only carries a simple message.
  */
@@ skipping 62 matching lines @@
 
   /**
    * Creates a new FormatException with an optional error [message].
    */
   const FormatException([this.message = ""]);
 
   String toString() => "FormatException: $message";
 }
 
 
-class WrongArgumentCountException implements Exception {
-  const WrongArgumentCountException();
-  String toString() => "WrongArgumentCountException";
-}
-
-
 class NullPointerException implements Exception {
   const NullPointerException([this.functionName, this.arguments = const []]);
   String toString() {
     if (functionName == null) {
       return exceptionName;
     } else {
       return "$exceptionName : method: '$functionName'\n"
           "Receiver: null\n"
           "Arguments: $arguments";
     }
@@ skipping 48 matching lines @@
 }
 
 /**
  * Exception thrown when a runtime error occurs.
  */
 class RuntimeError implements Exception {
   final message;
   RuntimeError(this.message);
   String toString() => "RuntimeError: $message";
 }