Use a valid WebMouseWheelEvent in stringification test

content/common/input/web_input_event_traits_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 "content/common/input/web_input_event_traits.h"
 
 #include <limits>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
@@ skipping 154 matching lines @@
 // Very basic smoke test to ensure stringification doesn't explode.
 TEST_F(WebInputEventTraitsTest, ToString) {
   WebKeyboardEvent key;
   key.type = WebInputEvent::RawKeyDown;
   EXPECT_FALSE(WebInputEventTraits::ToString(key).empty());
 
   WebMouseEvent mouse;
   mouse.type = WebInputEvent::MouseMove;
   EXPECT_FALSE(WebInputEventTraits::ToString(mouse).empty());
 
-  WebMouseEvent mouse_wheel;
+  WebMouseWheelEvent mouse_wheel;
   mouse_wheel.type = WebInputEvent::MouseWheel;
   EXPECT_FALSE(WebInputEventTraits::ToString(mouse_wheel).empty());
 
   WebGestureEvent gesture =
       CreateGesture(WebInputEvent::GesturePinchBegin, 1, 1);
   EXPECT_FALSE(WebInputEventTraits::ToString(gesture).empty());
 
   WebTouchEvent touch = CreateTouch(WebInputEvent::TouchStart);
   EXPECT_FALSE(WebInputEventTraits::ToString(touch).empty());
 }
 
 }  // namespace
 }  // namespace content