XMLHttpRequest#responseText should use a rope

Source/bindings/v8/ScriptString.cpp

Index: Source/bindings/v8/ScriptString.cpp
diff --git a/Source/modules/quota/StorageErrorCallback.cpp b/Source/bindings/v8/ScriptString.cpp
similarity index 71%
copy from Source/modules/quota/StorageErrorCallback.cpp
copy to Source/bindings/v8/ScriptString.cpp
index f8c89ad5750929757d407c61279800da6946c18b..317c53bd154f26d9d648641e391af885efa5fbd4 100644
--- a/Source/modules/quota/StorageErrorCallback.cpp
+++ b/Source/bindings/v8/ScriptString.cpp
@@ -29,26 +29,27 @@
  */
 
 #include "config.h"
-
-#include "modules/quota/StorageErrorCallback.h"
-
-#include "DOMException.h"
-#include "core/dom/DOMCoreException.h"
+#include "bindings/v8/ScriptString.h"
 
 namespace WebCore {
 
-StorageErrorCallback::CallbackTask::CallbackTask(PassRefPtr<StorageErrorCallback> callback, ExceptionCode ec)
-    : m_callback(callback)
-    , m_ec(ec)
+ScriptString ScriptString::concatenateWith(const String& string)
 {
+    v8::HandleScope handleScope;
+    v8::Handle<v8::String> b = v8String(string, v8::Isolate::GetCurrent());
+    if (hasNoValue())
+        return ScriptString(b);
+    v8::Handle<v8::String> a = v8::Handle<v8::String>::Cast(v8Value());
+    return ScriptString(v8::String::Concat(a, b));
 }
 
-void StorageErrorCallback::CallbackTask::performTask(ScriptExecutionContext*)
+String ScriptString::flattenToString() const
 {
-    if (!m_callback)
-        return;
-    ExceptionCodeDescription description(m_ec);
-    m_callback->handleEvent(DOMCoreException::create(description).get());
+    if (hasNoValue())
+        return String();
+    v8::HandleScope handleScope;
+    v8::Handle<v8::String> value = v8::Handle<v8::String>::Cast(v8Value());
+    return v8StringToWebCoreString<String>(value, Externalize);
 }
 
 } // namespace WebCore