[CSS Typed OM] Make CSSKeywordValue's value attribute mutable

third_party/WebKit/Source/core/css/cssom/CSSKeywordValue.h

Index: third_party/WebKit/Source/core/css/cssom/CSSKeywordValue.h
diff --git a/third_party/WebKit/Source/core/css/cssom/CSSKeywordValue.h b/third_party/WebKit/Source/core/css/cssom/CSSKeywordValue.h
index 1378b0a6af46c3127acff6ce8ca0aca3a7bde371..632aaef7de8d3e601f6924010077a9cc547b0dba 100644
--- a/third_party/WebKit/Source/core/css/cssom/CSSKeywordValue.h
+++ b/third_party/WebKit/Source/core/css/cssom/CSSKeywordValue.h
@@ -8,7 +8,6 @@
 #include "core/CSSValueKeywords.h"
 #include "core/CoreExport.h"
 #include "core/css/cssom/CSSStyleValue.h"
-#include "platform/wtf/text/AtomicString.h"
 
 namespace blink {
 
@@ -19,22 +18,22 @@ class CORE_EXPORT CSSKeywordValue final : public CSSStyleValue {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
-  static CSSKeywordValue* Create(const AtomicString& keyword);
-  static CSSKeywordValue* Create(const AtomicString& keyword, ExceptionState&);
+  static CSSKeywordValue* Create(const String& keyword);
+  static CSSKeywordValue* Create(const String& keyword, ExceptionState&);
   static CSSKeywordValue* FromCSSValue(const CSSValue&);
 
   StyleValueType GetType() const override { return kKeywordType; }
 
-  const AtomicString& keywordValue() const;
+  const String& value() const;
+  void setValue(const String& keyword) { keyword_value_ = keyword; }
   CSSValueID KeywordValueID() const;
 
   CSSValue* ToCSSValue() const override;
 
  private:
-  explicit CSSKeywordValue(const AtomicString& keyword)
-      : keyword_value_(keyword) {}
+  explicit CSSKeywordValue(const String& keyword) : keyword_value_(keyword) {}
 
-  AtomicString keyword_value_;
+  String keyword_value_;
 };
 
 DEFINE_TYPE_CASTS(CSSKeywordValue,