[Qt] Speed up KURL to QUrl conversion

https://bugs.webkit.org/show_bug.cgi?id=33873

The WebCore::String::utf8 method will use the generic WebCore::TextCodec
and then call the encode method on it. In QtWebKit this class is implemented
around the QTextCodec class. Instead of going the generic codec way we treat
the WebCore::String as a QString (no copying) and then use the built-in
QString::toUtf8 to do the conversion.

git-svn-id: svn://svn.chromium.org/blink/trunk@53995 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/WebCore/ChangeLog

+2010-01-18  Holger Hans Peter Freyther  <zecke@selfish.org>
+
+        Reviewed by Eric Seidel.
+
+        [Qt] Speed up KURL to QUrl conversion
+        https://bugs.webkit.org/show_bug.cgi?id=33873
+
+        The WebCore::String::utf8 method will use the generic WebCore::TextCodec
+        and then call the encode method on it. In QtWebKit this class is implemented
+        around the QTextCodec class. Instead of going the generic codec way we treat
+        the WebCore::String as a QString (no copying) and then use the built-in
+        QString::toUtf8 to do the conversion.
+
+        * platform/qt/KURLQt.cpp:
+        (WebCore::KURL::operator QUrl):
+
 2010-01-28  Ben Murdoch  <benm@google.com>
 
         Reviewed by Simon Hausmann.

third_party/WebKit/WebCore/platform/qt/KURLQt.cpp

@@ -86,7 +86,8 @@ KURL::operator QUrl() const
 #else
     // Qt 4.5 or later
     // No need for special encoding
-    QByteArray ba = m_string.utf8().data();
+    QString str = QString::fromRawData(reinterpret_cast<const QChar*>(m_string.characters()), m_string.length());
+    QByteArray ba = str.toUtf8();
 #endif
 
     QUrl url = QUrl::fromEncoded(ba);