Revert "Remove @deprecated features."

pkg/logging/lib/logging.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.
 
 /**
  * Support for debugging and error logging.
  *
  * This library introduces abstractions similar to those used in other
  * languages, such as the Closure JS Logger and java.util.logging.Logger.
  *
@@ skipping 291 matching lines @@
   final DateTime time;
 
   /** Unique sequence number greater than all log records created before it. */
   final int sequenceNumber;
 
   static int _nextNumber = 0;
 
   /** Associated error (if any) when recording errors messages. */
   final Object error;
 
+  // TODO(kevmoo) - remove before V1
+  /**
+   * DEPRECATED. Use [error] instead.
+   */
+  @deprecated
+  Object get exception => error;
+
   /** Associated stackTrace (if any) when recording errors messages. */
   final StackTrace stackTrace;
 
   LogRecord(this.level, this.message, this.loggerName, [this.error,
                                                         this.stackTrace])
       : time = new DateTime.now(),
         sequenceNumber = LogRecord._nextNumber++;
 
   String toString() => '[${level.name}] $loggerName: $message';
 }