Avoid calling hasAttribute() and then getAttribute() for performance

Source/core/editing/EditingStyle.cpp

Index: Source/core/editing/EditingStyle.cpp
diff --git a/Source/core/editing/EditingStyle.cpp b/Source/core/editing/EditingStyle.cpp
index 0d555c04bde1cfc481cbaed227d431cc1525763c..eaee4c96f0619f4b97b386fbaab27d297c494dcf 100644
--- a/Source/core/editing/EditingStyle.cpp
+++ b/Source/core/editing/EditingStyle.cpp
@@ -290,12 +290,13 @@ void HTMLAttributeEquivalent::addToStyle(Element* element, EditingStyle* style)
 PassRefPtrWillBeRawPtr<CSSValue> HTMLAttributeEquivalent::attributeValueAsCSSValue(Element* element) const
 {
     ASSERT(element);
-    if (!element->hasAttribute(m_attrName))
+    const AtomicString& value = element->getAttribute(m_attrName);
+    if (value.isNull())
         return nullptr;
 
     RefPtr<MutableStylePropertySet> dummyStyle;
     dummyStyle = MutableStylePropertySet::create();
-    dummyStyle->setProperty(m_propertyID, element->getAttribute(m_attrName));
+    dummyStyle->setProperty(m_propertyID, value);
     return dummyStyle->getPropertyCSSValue(m_propertyID);
 }
 
@@ -319,10 +320,11 @@ HTMLFontSizeEquivalent::HTMLFontSizeEquivalent()
 PassRefPtrWillBeRawPtr<CSSValue> HTMLFontSizeEquivalent::attributeValueAsCSSValue(Element* element) const
 {
     ASSERT(element);
-    if (!element->hasAttribute(m_attrName))
+    const AtomicString& value = element->getAttribute(m_attrName);
+    if (value.isNull())
         return nullptr;
     CSSValueID size;
-    if (!HTMLFontElement::cssValueFromFontSizeNumber(element->getAttribute(m_attrName), size))
+    if (!HTMLFontElement::cssValueFromFontSizeNumber(value, size))
         return nullptr;
     return CSSPrimitiveValue::createIdentifier(size);
 }