QString: rename parameter clashing with member function of the same name

The size parameter shadows the size() member function, so rename it to
newSize.

Prepares for a follow-up change that ports from count()/length() to
size().

Change-Id: I0ca8af57d6351f85a568409a8d02b66371bb05e7
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/text/qstring.cpp

@@ -2716,10 +2716,10 @@ void QString::resize(qsizetype size)
     \snippet qstring/main.cpp 46
 */
 
-void QString::resize(qsizetype size, QChar fillChar)
+void QString::resize(qsizetype newSize, QChar fillChar)
 {
     const qsizetype oldSize = length();
-    resize(size);
+    resize(newSize);
     const qsizetype difference = length() - oldSize;
     if (difference > 0)
         std::fill_n(d.data() + oldSize, difference, fillChar.unicode());