Remove unneeded WebKit enum forward declarations

third_party/WebKit/Source/core/layout/api/LineLayoutItem.h

 // Copyright 2015 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.
 
 #ifndef LineLayoutItem_h
 #define LineLayoutItem_h
 
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutObjectInlines.h"
 #include "core/layout/LayoutText.h"
 #include "core/paint/ObjectPaintInvalidator.h"
 
 #include "platform/LayoutUnit.h"
 #include "platform/wtf/Allocator.h"
 #include "platform/wtf/HashTableDeletedValueType.h"
 
 namespace blink {
 
 class ComputedStyle;
 class Document;
 class HitTestRequest;
 class HitTestLocation;
 class LayoutObject;
 class LineLayoutBox;
 class LineLayoutBoxModel;
 class LineLayoutAPIShim;
 
-enum HitTestFilter;
-
 static LayoutObject* const kHashTableDeletedValue =
     reinterpret_cast<LayoutObject*>(-1);
 
 class LineLayoutItem {
   DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 
  public:
   explicit LineLayoutItem(LayoutObject* layout_object)
       : layout_object_(layout_object) {}
 
@@ skipping 318 matching lines @@
 
 template <>
 struct HashTraits<blink::LineLayoutItem>
     : SimpleClassHashTraits<blink::LineLayoutItem> {
   STATIC_ONLY(HashTraits);
 };
 
 }  // namespace WTF
 
 #endif  // LineLayoutItem_h