ozone: Fix chromium-style method override warnings

ui/events/ozone/evdev/touch_event_converter_evdev_unittest.cc

 // 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.
 
 #include <errno.h>
 #include <fcntl.h>
 #include <linux/input.h>
 #include <unistd.h>
 
 #include <vector>
@@ skipping 51 matching lines @@
   int write_pipe_;
 
   DISALLOW_COPY_AND_ASSIGN(MockTouchEventConverterEvdev);
 };
 
 class MockDeviceEventDispatcherEvdev : public DeviceEventDispatcherEvdev {
  public:
   MockDeviceEventDispatcherEvdev(
       const base::Callback<void(const TouchEventParams& params)>& callback)
       : callback_(callback) {}
-  ~MockDeviceEventDispatcherEvdev() {}
+  ~MockDeviceEventDispatcherEvdev() override {}
 
   // DeviceEventDispatcherEvdev:
   void DispatchKeyEvent(const KeyEventParams& params) override {}
   void DispatchMouseMoveEvent(const MouseMoveEventParams& params) override {}
   void DispatchMouseButtonEvent(const MouseButtonEventParams& params) override {
   }
   void DispatchMouseWheelEvent(const MouseWheelEventParams& params) override {}
   void DispatchScrollEvent(const ScrollEventParams& params) override {}
   void DispatchTouchEvent(const TouchEventParams& params) override {
     callback_.Run(params);
@@ skipping 472 matching lines @@
       {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 777},
       {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 666},
       {{0, 0}, EV_SYN, SYN_REPORT, 0},
   };
 
   // Check that one 1 event is generated
   dev->ConfigureReadMock(mock_kernel_queue, arraysize(mock_kernel_queue), 0);
   dev->ReadNow();
   EXPECT_EQ(1u, size());
 }