Make sure to use CSSValueID and CSSPropertyID rather than integers.

Source/core/html/HTMLFontElement.cpp

Index: Source/core/html/HTMLFontElement.cpp
diff --git a/Source/core/html/HTMLFontElement.cpp b/Source/core/html/HTMLFontElement.cpp
index 56b7508a6eeaa183ef183e9cb61312693e5e5d60..9a11a697409a19fb8a5999cee3c11e0c4dda685e 100644
--- a/Source/core/html/HTMLFontElement.cpp
+++ b/Source/core/html/HTMLFontElement.cpp
@@ -143,7 +143,7 @@ static bool parseFontSize(const String& input, int& size)
     return parseFontSize(input.characters16(), input.length(), size);
 }
 
-bool HTMLFontElement::cssValueFromFontSizeNumber(const String& s, int& size)
+bool HTMLFontElement::cssValueFromFontSizeNumber(const String& s, CSSValueID& size)
 {
     int num = 0;
     if (!parseFontSize(s, num))
@@ -188,7 +188,7 @@ bool HTMLFontElement::isPresentationAttribute(const QualifiedName& name) const
 void HTMLFontElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomicString& value, MutableStylePropertySet* style)
 {
     if (name == sizeAttr) {
-        int size = 0;
+        CSSValueID size = CSSValueInvalid;
         if (cssValueFromFontSizeNumber(value, size))
             addPropertyToPresentationAttributeStyle(style, CSSPropertyFontSize, size);
     } else if (name == colorAttr)