Move WebMouseWheelEvent into its own header file.

content/browser/renderer_host/input/touch_emulator_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/browser/renderer_host/input/touch_emulator.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 #include "content/browser/renderer_host/input/touch_emulator_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/WebKit/public/platform/WebMouseWheelEvent.h"
 #include "ui/events/blink/web_input_event_traits.h"
 
 using blink::WebGestureEvent;
 using blink::WebInputEvent;
 using blink::WebKeyboardEvent;
 using blink::WebMouseEvent;
 using blink::WebMouseWheelEvent;
 using blink::WebTouchEvent;
 using blink::WebTouchPoint;
 
@@ skipping 567 matching lines @@
   emulator()->SetDeviceScaleFactor(1.0f);
   EXPECT_EQ(1.0f, GetCursorScaleFactor());
 
   TouchEmulator another(this, 4.0f);
   EXPECT_EQ(1.0f, GetCursorScaleFactor());
   another.Enable(ui::GestureProviderConfigType::GENERIC_MOBILE);
   EXPECT_EQ(2.0f, GetCursorScaleFactor());
 }
 
 }  // namespace content