Remove all uses of the ASCIILiteral class.

Source/core/xml/XMLHttpRequest.cpp

Index: Source/core/xml/XMLHttpRequest.cpp
diff --git a/Source/core/xml/XMLHttpRequest.cpp b/Source/core/xml/XMLHttpRequest.cpp
index ad2ac40336af08f2658fcd3ac7bd4a70748a131b..e65a4a720fdbfada888d91a162972db8b908dfab 100644
--- a/Source/core/xml/XMLHttpRequest.cpp
+++ b/Source/core/xml/XMLHttpRequest.cpp
@@ -646,7 +646,7 @@ void XMLHttpRequest::send(DOMFormData* body, ExceptionState& es)
 
         String contentType = getRequestHeader("Content-Type");
         if (contentType.isEmpty()) {
-            contentType = String(ASCIILiteral("multipart/form-data; boundary=")) + m_requestEntityBody->boundary().data();
+            contentType = String("multipart/form-data; boundary=") + m_requestEntityBody->boundary().data();
             setRequestHeaderInternal("Content-Type", contentType);
         }
     }