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

Source/WebCore/bindings/v8/V8NPUtils.cpp

 /*
  * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 44 matching lines @@
 
     if (object->IsNumber())
         DOUBLE_TO_NPVARIANT(object->NumberValue(), *result);
     else if (object->IsBoolean())
         BOOLEAN_TO_NPVARIANT(object->BooleanValue(), *result);
     else if (object->IsNull())
         NULL_TO_NPVARIANT(*result);
     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);
         if (npobject)
             _NPN_RegisterObject(npobject, owner);
         OBJECT_TO_NPVARIANT(npobject, *result);
     }
 }
 
 v8::Handle<v8::Value> convertNPVariantToV8Object(const NPVariant* variant, NPObject* npobject)
@@ skipping 81 matching lines @@
 ExceptionCatcher::~ExceptionCatcher()
 {
     if (!m_tryCatch.HasCaught())
         return;
 
     if (topHandler)
         topHandler->handler(topHandler->data, *v8::String::Utf8Value(m_tryCatch.Exception()));
 }
 
 } // namespace WebCore