Revert 105389 - [v8] Low efficiency of writing long string from web application to plugin.

Source/WebCore/bindings/v8/V8NPUtils.cpp

Index: Source/WebCore/bindings/v8/V8NPUtils.cpp
===================================================================
--- Source/WebCore/bindings/v8/V8NPUtils.cpp	(revision 111474)
+++ Source/WebCore/bindings/v8/V8NPUtils.cpp	(working copy)
@@ -62,11 +62,11 @@
     else if (object->IsUndefined())
         VOID_TO_NPVARIANT(*result);
     else if (object->IsString()) {
-        v8::Handle<v8::String> str = object->ToString();
-        int length = str->Utf8Length() + 1;
+        v8::String::Utf8Value utf8(object);
+        int length = utf8.length() + 1;
         char* utf8Chars = reinterpret_cast<char*>(malloc(length));
-        str->WriteUtf8(utf8Chars, length, 0, v8::String::HINT_MANY_WRITES_EXPECTED);
-        STRINGN_TO_NPVARIANT(utf8Chars, length-1, *result);
+        memcpy(utf8Chars, *utf8, length);
+        STRINGN_TO_NPVARIANT(utf8Chars, utf8.length(), *result);
     } else if (object->IsObject()) {
         DOMWindow* window = V8Proxy::retrieveWindow(V8Proxy::currentContext());
         NPObject* npobject = npCreateV8ScriptObject(0, v8::Handle<v8::Object>::Cast(object), window);