[Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/core/css/StyleRuleImport.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2008, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 22 matching lines @@
 class MediaQuerySet;
 class StyleSheetContents;
 
 class StyleRuleImport : public StyleRuleBase {
     USING_FAST_MALLOC_WILL_BE_REMOVED(StyleRuleImport);
 public:
     static PassRefPtrWillBeRawPtr<StyleRuleImport> create(const String& href, PassRefPtrWillBeRawPtr<MediaQuerySet>);
 
     ~StyleRuleImport();
 
-    StyleSheetContents* parentStyleSheet() const { return m_parentStyleSheet; }
-    void setParentStyleSheet(StyleSheetContents* sheet) { ASSERT(sheet); m_parentStyleSheet = sheet; }
-    void clearParentStyleSheet() { m_parentStyleSheet = nullptr; }
+    StyleSheetContents* parentStyleSheet() const;
+    void setParentStyleSheet(StyleSheetContents*);
+    void clearParentStyleSheet();
 
     String href() const { return m_strHref; }
-    StyleSheetContents* styleSheet() const { return m_styleSheet.get(); }
+    StyleSheetContents* styleSheet() const;
 
     bool isLoading() const;
-    MediaQuerySet* mediaQueries() { return m_mediaQueries.get(); }
+    MediaQuerySet* mediaQueries() const;
 
     void requestStyleSheet();
 
     DECLARE_TRACE_AFTER_DISPATCH();
 
 private:
     // FIXME: inherit from StyleSheetResourceClient directly to eliminate raw back pointer, as there are no space savings in this.
     // NOTE: We put the StyleSheetResourceClient in a member instead of inheriting from it
     // to avoid adding a vptr to StyleRuleImport.
     class ImportedStyleSheetClient final : public StyleSheetResourceClient {
@@ skipping 29 matching lines @@
     RefPtrWillBeMember<StyleSheetContents> m_styleSheet;
     ResourcePtr<CSSStyleSheetResource> m_resource;
     bool m_loading;
 };
 
 DEFINE_STYLE_RULE_TYPE_CASTS(Import);
 
 } // namespace blink
 
 #endif