Make cssFloat an enumerable property of CSSStyleDeclaration

Source/core/css/CSSComputedStyleDeclaration.h

Index: Source/core/css/CSSComputedStyleDeclaration.h
diff --git a/Source/core/css/CSSComputedStyleDeclaration.h b/Source/core/css/CSSComputedStyleDeclaration.h
index 92ffc5d943ffc7dc57fad1492a9a1b209f77eb85..6fc6e4f7416197a587a23644bf3d2531eaa5f4b4 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.h
+++ b/Source/core/css/CSSComputedStyleDeclaration.h
@@ -91,6 +91,8 @@ private:
     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;
     PassRefPtrWillBeRawPtr<CSSValue> getPropertyCSSValueInternal(CSSPropertyID) override;