Move WebMouseWheelEvent into its own header file.

third_party/WebKit/Source/web/AssertMatchingEnums.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 73 matching lines @@
 #include "public/platform/WebFileError.h"
 #include "public/platform/WebFileInfo.h"
 #include "public/platform/WebFileSystem.h"
 #include "public/platform/WebFontDescription.h"
 #include "public/platform/WebHistoryScrollRestorationType.h"
 #include "public/platform/WebInputEvent.h"
 #include "public/platform/WebMediaPlayer.h"
 #include "public/platform/WebMediaPlayerClient.h"
 #include "public/platform/WebMediaSource.h"
 #include "public/platform/WebMediaStreamSource.h"
+#include "public/platform/WebMouseWheelEvent.h"
 #include "public/platform/WebPageVisibilityState.h"
 #include "public/platform/WebReferrerPolicy.h"
 #include "public/platform/WebScrollbar.h"
 #include "public/platform/WebScrollbarBehavior.h"
 #include "public/platform/WebSelectionBound.h"
 #include "public/platform/WebStorageQuotaError.h"
 #include "public/platform/WebStorageQuotaType.h"
 #include "public/platform/WebURLRequest.h"
 #include "public/platform/WebURLResponse.h"
 #include "public/platform/modules/indexeddb/WebIDBCursor.h"
@@ skipping 804 matching lines @@
                    ProgressBarCompletion::DOMContentLoaded);
 STATIC_ASSERT_ENUM(
     WebSettings::ProgressBarCompletion::ResourcesBeforeDCLAndSameOriginIFrames,
     ProgressBarCompletion::ResourcesBeforeDCLAndSameOriginIFrames);
 
 static_assert(kSerializedScriptValueVersion ==
                   SerializedScriptValue::wireFormatVersion,
               "");
 
 }  // namespace blink