Moves WorkspaceEventHandler to ash/common

ash/wm/workspace/workspace_event_handler_test_helper.cc

Index: ash/wm/workspace/workspace_event_handler_test_helper.cc
diff --git a/ash/wm/workspace/workspace_event_handler_test_helper.cc b/ash/wm/workspace/workspace_event_handler_test_helper.cc
deleted file mode 100644
index 69c59183eb225996a0f80f92a8d471092bd29a01..0000000000000000000000000000000000000000
--- a/ash/wm/workspace/workspace_event_handler_test_helper.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright (c) 2012 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.
-
-#include "ash/wm/workspace/workspace_event_handler_test_helper.h"
-
-namespace ash {
-
-WorkspaceEventHandlerTestHelper::WorkspaceEventHandlerTestHelper(
-    WorkspaceEventHandler* handler)
-    : handler_(handler) {}
-
-WorkspaceEventHandlerTestHelper::~WorkspaceEventHandlerTestHelper() {}
-
-}  // namespace ash