moved matrix class from utils to samples

utils/matrix/matrix_client.dartlib

Index: utils/matrix/matrix_client.dartlib
diff --git a/utils/matrix/matrix_client.dartlib b/utils/matrix/matrix_client.dartlib
deleted file mode 100644
index d113a9f116f4f36f26397e5f8b380f540a7a9cff..0000000000000000000000000000000000000000
--- a/utils/matrix/matrix_client.dartlib
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright (c) 2011, 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 definition file for the matrix library for browser applications.
- * (This imports dart:dom because the Matrix4 class uses Float32Array.
- */
-#library("matrix");
-#import("dart:dom");
-#source("matrix4.dart");