Remove several uses of toWebCoreStringWithNullCheck(v8::Handle<v8::Value>)

Source/bindings/v8/custom/V8XMLHttpRequestCustom.cpp

Index: Source/bindings/v8/custom/V8XMLHttpRequestCustom.cpp
diff --git a/Source/bindings/v8/custom/V8XMLHttpRequestCustom.cpp b/Source/bindings/v8/custom/V8XMLHttpRequestCustom.cpp
index c0a2d307054c27a4bf7542297253f15a84a012e2..177533df4c983f93514a76ff27cbe5bd0ab403f4 100644
--- a/Source/bindings/v8/custom/V8XMLHttpRequestCustom.cpp
+++ b/Source/bindings/v8/custom/V8XMLHttpRequestCustom.cpp
@@ -183,11 +183,11 @@ void V8XMLHttpRequest::openMethodCustom(const v8::FunctionCallbackInfo<v8::Value
         bool async = info[2]->BooleanValue();
 
         if (info.Length() >= 4 && !info[3]->IsUndefined()) {
-            String user = toWebCoreStringWithNullCheck(info[3]);
+            V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<WithNullCheck>, user, info[3]);
 
             if (info.Length() >= 5 && !info[4]->IsUndefined()) {
-                String passwd = toWebCoreStringWithNullCheck(info[4]);
-                xmlHttpRequest->open(method, url, async, user, passwd, exceptionState);
+                V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<WithNullCheck>, password, info[4]);
+                xmlHttpRequest->open(method, url, async, user, password, exceptionState);
             } else {
                 xmlHttpRequest->open(method, url, async, user, exceptionState);
             }
@@ -247,7 +247,8 @@ void V8XMLHttpRequest::sendMethodCustom(const v8::FunctionCallbackInfo<v8::Value
             ASSERT(arrayBufferView);
             xmlHttpRequest->send(arrayBufferView, exceptionState);
         } else {
-            xmlHttpRequest->send(toWebCoreStringWithNullCheck(arg), exceptionState);
+            V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<WithNullCheck>, argString, arg);
+            xmlHttpRequest->send(argString, exceptionState);
         }
     }