Add number() static methods to AtomicString class

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index eb460333e5b95235ed2704f3e89e9b50ffecbc31..b792d73046ac4f848dc2a58c4bf1eae62b7c3415 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -2752,8 +2752,7 @@ int Element::getIntegralAttribute(const QualifiedName& attributeName) const
 
 void Element::setIntegralAttribute(const QualifiedName& attributeName, int value)
 {
-    // FIXME: Need an AtomicString version of String::number.
-    setAttribute(attributeName, String::number(value));
+    setAttribute(attributeName, AtomicString::number(value));
 }
 
 unsigned Element::getUnsignedIntegralAttribute(const QualifiedName& attributeName) const
@@ -2763,8 +2762,7 @@ unsigned Element::getUnsignedIntegralAttribute(const QualifiedName& attributeNam
 
 void Element::setUnsignedIntegralAttribute(const QualifiedName& attributeName, unsigned value)
 {
-    // FIXME: Need an AtomicString version of String::number.
-    setAttribute(attributeName, String::number(value));
+    setAttribute(attributeName, AtomicString::number(value));
 }
 
 bool Element::childShouldCreateRenderer(const Node& child) const