Make calls to AtomicString(const String&) explicit in css/

Source/core/css/FontFace.cpp

Index: Source/core/css/FontFace.cpp
diff --git a/Source/core/css/FontFace.cpp b/Source/core/css/FontFace.cpp
index c8121ce9e53f6fa5863e83a1d958b44aceea77de..d170b957b0c2a9d8fdf86c361a1ccee83693a26e 100644
--- a/Source/core/css/FontFace.cpp
+++ b/Source/core/css/FontFace.cpp
@@ -98,7 +98,7 @@ static PassRefPtr<CSSValue> parseCSSValue(const String& s, CSSPropertyID propert
     return parsedStyle->getPropertyCSSValue(propertyID);
 }
 
-PassRefPtr<FontFace> FontFace::create(const String& family, const String& source, const Dictionary& descriptors, ExceptionState& exceptionState)
+PassRefPtr<FontFace> FontFace::create(const AtomicString& family, const String& source, const Dictionary& descriptors, ExceptionState& exceptionState)
 {
     RefPtr<CSSValue> src = parseCSSValue(source, CSSPropertySrc);
     if (!src || !src->isValueList()) {
@@ -291,9 +291,9 @@ bool FontFace::setFamilyValue(CSSValueList* familyList)
         return false;
 
     CSSPrimitiveValue* familyValue = toCSSPrimitiveValue(familyList->itemWithoutBoundsCheck(0));
-    String family;
+    AtomicString family;
     if (familyValue->isString()) {
-        family = familyValue->getStringValue();
+        family = AtomicString(familyValue->getStringValue());
     } else if (familyValue->isValueID()) {
         // We need to use the raw text for all the generic family types, since @font-face is a way of actually
         // defining what font to use for those types.