Rename sky::TestObserver to sky::TestHarness

sky/viewer/test_observer.mojom

Index: sky/viewer/test_observer.mojom
diff --git a/sky/viewer/test_observer.mojom b/sky/viewer/test_observer.mojom
deleted file mode 100644
index ed74c9d4c787e14adb8009292cdae0003940ef5d..0000000000000000000000000000000000000000
--- a/sky/viewer/test_observer.mojom
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-module sky;
-
-interface TestObserver {
-  OnTestComplete(string test_result);
-};