Resubmission of sashab's patch: Make CSSComputedStyledeclaration::getPropertyCSSValue return const

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

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 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 Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 40 matching lines @@
     {
         return new CSSComputedStyleDeclaration(node, allowVisitedStyle, pseudoElementName);
     }
     ~CSSComputedStyleDeclaration() override;
 
     String getPropertyValue(CSSPropertyID) const;
     bool getPropertyPriority(CSSPropertyID) const;
 
     MutableStylePropertySet* copyProperties() const;
 
-    CSSValue* getPropertyCSSValue(CSSPropertyID) const;
-    CSSValue* getPropertyCSSValue(AtomicString customPropertyName) const;
+    const CSSValue* getPropertyCSSValue(CSSPropertyID) const;
+    const CSSValue* getPropertyCSSValue(AtomicString customPropertyName) const;
     std::unique_ptr<HashMap<AtomicString, RefPtr<CSSVariableData>>> getVariables() const;
 
-    CSSValue* getFontSizeCSSValuePreferringKeyword() const;
+    const CSSValue* getFontSizeCSSValuePreferringKeyword() const;
     bool isMonospaceFont() const;
 
     MutableStylePropertySet* copyPropertiesInSet(const Vector<CSSPropertyID>&) const;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     CSSComputedStyleDeclaration(Node*, bool allowVisitedStyle, const String&);
 
     // The styled node is either the node passed into getComputedStyle, or the
@@ skipping 11 matching lines @@
     String getPropertyValue(const String& propertyName) override;
     String getPropertyPriority(const String& propertyName) override;
     String getPropertyShorthand(const String& propertyName) override;
     bool isPropertyImplicit(const String& propertyName) override;
     void setProperty(const String& propertyName, const String& value, const String& priority, ExceptionState&) override;
     String removeProperty(const String& propertyName, ExceptionState&) override;
     String cssFloat() const;
     void setCSSFloat(const String&, ExceptionState&);
     String cssText() const override;
     void setCSSText(const String&, ExceptionState&) override;
-    CSSValue* getPropertyCSSValueInternal(CSSPropertyID) override;
+    const CSSValue* getPropertyCSSValueInternal(CSSPropertyID) override;
     String getPropertyValueInternal(CSSPropertyID) override;
     void setPropertyInternal(CSSPropertyID, const String& customPropertyName, const String& value, bool important, ExceptionState&) override;
 
     bool cssPropertyMatches(CSSPropertyID, const CSSValue*) const override;
 
     Member<Node> m_node;
     PseudoId m_pseudoElementSpecifier;
     bool m_allowVisitedStyle;
 };
 
 } // namespace blink
 
 #endif // CSSComputedStyleDeclaration_h