Move WebMouseWheelEvent into its own header file.

chrome/browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper.mm

 // 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.
 
 #import "chrome/browser/renderer_host/chrome_render_widget_host_view_mac_history_swiper.h"
 
 #import "base/mac/sdk_forward_declarations.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_finder.h"
 #import "chrome/browser/ui/cocoa/history_overlay_controller.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "third_party/WebKit/public/platform/WebGestureEvent.h"
+#include "third_party/WebKit/public/platform/WebMouseWheelEvent.h"
 
 namespace {
 // The horizontal distance required to cause the browser to perform a history
 // navigation.
 const CGFloat kHistorySwipeThreshold = 0.08;
 
 // The horizontal distance required for this class to start consuming events,
 // which stops the events from reaching the renderer.
 const CGFloat kConsumeEventThreshold = 0.01;
 
@@ skipping 559 matching lines @@
   }
 }
 
 @end
 
 @implementation HistorySwiper (PrivateExposedForTesting)
 + (void)resetMagicMouseState {
   forceMagicMouse = NO;
 }
 @end