Add number() static methods to AtomicString class

Source/core/html/HTMLViewSourceDocument.cpp

Index: Source/core/html/HTMLViewSourceDocument.cpp
diff --git a/Source/core/html/HTMLViewSourceDocument.cpp b/Source/core/html/HTMLViewSourceDocument.cpp
index aff770f310089f5cfa1ba740a6b1f6ee60854105..4a55226d0b4487a1c303cd08fa9b023b8df80a78 100644
--- a/Source/core/html/HTMLViewSourceDocument.cpp
+++ b/Source/core/html/HTMLViewSourceDocument.cpp
@@ -197,7 +197,7 @@ void HTMLViewSourceDocument::addLine(const AtomicString& className)
     // Create a cell that will hold the line number (it is generated in the stylesheet using counters).
     RefPtr<HTMLTableCellElement> td = HTMLTableCellElement::create(tdTag, *this);
     td->setAttribute(classAttr, "webkit-line-number");
-    td->setAttribute(valueAttr, String::number(++m_lineNumber));
+    td->setIntegralAttribute(valueAttr, ++m_lineNumber);
     trow->parserAppendChild(td);
 
     // Create a second cell for the line contents