Removing a bunch of unused platform code.

Source/WTF/wtf/text/WTFString.cpp

Index: Source/WTF/wtf/text/WTFString.cpp
diff --git a/Source/WTF/wtf/text/WTFString.cpp b/Source/WTF/wtf/text/WTFString.cpp
index 75e769388c93cbce97be2fe2376e8eaa5e7e89be..1da15c48c6301ca850ceb75cdca6e9c30f6c17e5 100644
--- a/Source/WTF/wtf/text/WTFString.cpp
+++ b/Source/WTF/wtf/text/WTFString.cpp
@@ -412,21 +412,7 @@ const UChar* String::charactersWithNullTermination()
 
 String String::format(const char *format, ...)
 {
-#if PLATFORM(QT)
-    // Use QString::vsprintf to avoid the locale dependent formatting of vsnprintf.
-    // https://bugs.webkit.org/show_bug.cgi?id=18994
-    va_list args;
-    va_start(args, format);
-
-    QString buffer;
-    buffer.vsprintf(format, args);
-
-    va_end(args);
-
-    QByteArray ba = buffer.toUtf8();
-    return StringImpl::create(reinterpret_cast<const LChar*>(ba.constData()), ba.length());
-
-#elif OS(WINCE)
+#if OS(WINCE)
     va_list args;
     va_start(args, format);