blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/css/resolver/ScopedStyleResolver.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
  * All rights reserved.
  * 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:
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 22 matching lines @@
 #include "core/css/ElementRuleCollector.h"
 #include "core/css/RuleSet.h"
 #include "core/dom/TreeScope.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
 
 class PageRuleCollector;
 class StyleSheetContents;
-class ViewportStyleResolver;
 
 // This class selects a ComputedStyle for a given element based on a collection
 // of stylesheets.
 class ScopedStyleResolver final : public GarbageCollected<ScopedStyleResolver> {
   WTF_MAKE_NONCOPYABLE(ScopedStyleResolver);
 
  public:
   static ScopedStyleResolver* create(TreeScope& scope) {
     return new ScopedStyleResolver(scope);
   }
@@ skipping 64 matching lines @@
   using CSSStyleSheetRuleSubSet = HeapVector<Member<RuleSubSet>>;
 
   Member<CSSStyleSheetRuleSubSet> m_treeBoundaryCrossingRuleSet;
   bool m_hasDeepOrShadowSelector = false;
   bool m_hasUnresolvedKeyframesRule = false;
 };
 
 }  // namespace blink
 
 #endif  // ScopedStyleResolver_h