Fix autoupdate_EndToEndTest on veyron_rialto

ui/base/ime/chromeos/mock_component_extension_ime_manager.h

+// Copyright 2017 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 UI_BASE_IME_MOCK_CHROMEOS_COMPONENT_EXTENSION_IME_MANAGER_H_
+#define UI_BASE_IME_MOCK_CHROMEOS_COMPONENT_EXTENSION_IME_MANAGER_H_
+
+#include "ui/base/ime/chromeos/component_extension_ime_manager.h"
+
+namespace chromeos {
+
+class UI_BASE_IME_EXPORT MockComponentExtensionIMEManager
+    : public ComponentExtensionIMEManager {
+ public:
+  input_method::InputMethodDescriptors GetXkbIMEAsInputMethodDescriptor()
+      override;
+};
+
+}  // namespace chromeos
+
+#endif  //  UI_BASE_IME_MOCK_CHROMEOS_COMPONENT_EXTENSION_IME_MANAGER_H_