Use fastGetAttribute in more places

Source/core/html/HTMLImageElement.cpp

Index: Source/core/html/HTMLImageElement.cpp
diff --git a/Source/core/html/HTMLImageElement.cpp b/Source/core/html/HTMLImageElement.cpp
index 309c06602154c5653169ff3ecbf8be7c8b883e0a..511aa03cae9921b0aa6b8606395c5e9694030c71 100644
--- a/Source/core/html/HTMLImageElement.cpp
+++ b/Source/core/html/HTMLImageElement.cpp
@@ -182,8 +182,9 @@ const AtomicString& HTMLImageElement::altText() const
     // lets figure out the alt text.. magic stuff
     // http://www.w3.org/TR/1998/REC-html40-19980424/appendix/notes.html#altgen
     // also heavily discussed by Hixie on bugzilla
-    if (!getAttribute(altAttr).isNull())
-        return getAttribute(altAttr);
+    const AtomicString& alt = fastGetAttribute(altAttr);
+    if (!alt.isNull())
+        return alt;
     // fall back to title attribute
     return getAttribute(titleAttr);

[Inactive, 2014/02/13 16:03:43]

Why don't we use fastGetAttribute for this one?

 }
@@ -320,7 +321,7 @@ bool HTMLImageElement::isURLAttribute(const Attribute& attribute) const
 
 const AtomicString& HTMLImageElement::alt() const
 {
-    return getAttribute(altAttr);
+    return fastGetAttribute(altAttr);
 }
 
 bool HTMLImageElement::draggable() const