ash: Fix flaky TrayIME* tests.

ash/test/virtual_keyboard_test_helper.h

Index: ash/test/virtual_keyboard_test_helper.h
diff --git a/ash/test/virtual_keyboard_test_helper.h b/ash/test/virtual_keyboard_test_helper.h
deleted file mode 100644
index 92111edc882b900a6ccb00d7133413d8794c3e17..0000000000000000000000000000000000000000
--- a/ash/test/virtual_keyboard_test_helper.h
+++ /dev/null
@@ -1,21 +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.
-
-#ifndef ASH_TEST_VIRTUAL_KEYBOARD_TEST_HELPER_H_
-#define ASH_TEST_VIRTUAL_KEYBOARD_TEST_HELPER_H_
-
-namespace ash {
-namespace test {
-
-class VirtualKeyboardTestHelper {
- public:
-  // Mocks the input device configuration so that the on-screen keyboard is
-  // suppressed.
-  static void SuppressKeyboard();
-};
-
-}  // namespace test
-}  // namespace ash
-
-#endif  // ASH_TEST_VIRTUAL_KEYBOARD_TEST_HELPER_H_