Convert NoMoreElementsException and EmptyQueueException to StateError.

lib/core/queue.dart

Index: lib/core/queue.dart
diff --git a/lib/core/queue.dart b/lib/core/queue.dart
index beff3d7b9942e9e632d43bd9cc999fc8c1fd488c..33da871e6dc1e93198781ac23382f579891e73d9 100644
--- a/lib/core/queue.dart
+++ b/lib/core/queue.dart
@@ -22,13 +22,13 @@ abstract class Queue<E> extends Collection<E> {
 
   /**
    * Removes and returns the first element of this queue. Throws an
-   * [EmptyQueueException] exception if this queue is empty.
+   * [StateError] exception if this queue is empty.
    */
   E removeFirst();
 
   /**
    * Removes and returns the last element of the queue. Throws an
-   * [EmptyQueueException] exception if this queue is empty.
+   * [StateError] exception if this queue is empty.
    */
   E removeLast();
 
@@ -55,13 +55,13 @@ abstract class Queue<E> extends Collection<E> {
 
   /**
    * Returns the first element of the queue. Throws an
-   * [EmptyQueueException] exception if this queue is empty.
+   * [StateError] exception if this queue is empty.
    */
   E first();
 
   /**
    * Returns the last element of the queue. Throws an
-   * [EmptyQueueException] exception if this queue is empty.
+   * [StateError] exception if this queue is empty.
    */
   E last();