Change device IDs from unsigned to signed.

ui/events/test/events_test_utils_x11.h

 // Copyright 2013 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_EVENTS_TEST_EVENTS_TEST_UTILS_X11_H_
 #define UI_EVENTS_TEST_EVENTS_TEST_UTILS_X11_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/devices/x11/device_data_manager_x11.h"
 #include "ui/events/event_constants.h"
@@ skipping 72 matching lines @@
   void Cleanup();
 
   void SetUpValuators(const std::vector<Valuator>& valuators);
 
   scoped_ptr<XEvent, XEventDeleter> event_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedXI2Event);
 };
 
 // Initializes a test touchpad device for scroll events.
-void SetUpTouchPadForTest(unsigned int deviceid);
+void SetUpTouchPadForTest(int deviceid);
 
 // Initializes a list of touchscreen devices for touch events.
-void SetUpTouchDevicesForTest(const std::vector<unsigned int>& devices);
+void SetUpTouchDevicesForTest(const std::vector<int>& devices);
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_TEST_EVENTS_TEST_UTILS_X11_H_