Fix 'auto variable type must not deduce to a raw pointer type' errors in Ozone/Wayland code

ui/ozone/platform/wayland/wayland_keyboard_unittest.cc

 // 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.
 
 #include <linux/input.h>
 #include <wayland-server.h>
 
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/events/event.h"
@@ skipping 43 matching lines @@
   wl_keyboard_send_key(keyboard->resource(), 2, 0, 30 /* a */,
                        WL_KEYBOARD_KEY_STATE_PRESSED);
 
   std::unique_ptr<Event> event;
   EXPECT_CALL(delegate, DispatchEvent(_)).WillOnce(CloneEvent(&event));
 
   Sync();
   ASSERT_TRUE(event);
   ASSERT_TRUE(event->IsKeyEvent());
 
-  auto key_event = event->AsKeyEvent();
+  auto* key_event = event->AsKeyEvent();
   EXPECT_EQ(ui::VKEY_A, key_event->key_code());
   EXPECT_EQ(ET_KEY_PRESSED, key_event->type());
 
   wl_keyboard_send_leave(keyboard->resource(), 3, surface->resource());
 
   Sync();
 
   wl_keyboard_send_key(keyboard->resource(), 3, 0, 30 /* a */,
                        WL_KEYBOARD_KEY_STATE_PRESSED);
   EXPECT_CALL(delegate, DispatchEvent(_)).Times(0);
 }
 
 }  // namespace ui