Remove some unused code from QTestCoreList

A count(T *list) was declared but not defined; and the plain count()
that was defined isn't called by anything.  It's in a private header,
so can be removed without harm.

Task-number: QTPM-1385
Change-Id: I1ac580d57996895a4123b4f55fa984e9c8001ecb
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@qt.io>

src/testlib/qtestcorelist_p.h

@@ -66,9 +66,6 @@ class QTestCoreList
         void addToList(T **list);
         T *nextElement();
         T *previousElement();
-        int count(T *list);
-        int count();
-
     private:
         T *next;
         T *prev;
@@ -121,20 +118,6 @@ T *QTestCoreList<T>::previousElement()
     return prev;
 }
 
-template <class T>
-int QTestCoreList<T>::count()
-{
-    int numOfElements = 0;
-    T *it = next;
-
-    while (it) {
-        ++numOfElements;
-        it = it->nextElement();
-    }
-
-    return numOfElements;
-}
-
 QT_END_NAMESPACE
 
 #endif