Remove QPerformanceTimer now that QElapsedTimer contains the necessary bits
QPerformanceTimer was a copy of QElapsedTimer with some additional functionality
which has since been subsumed into QElapsedTimer, so remove the forked code.
(backport of
cd6ebb4912a5d96c788ea0c838d8a1a06ff4029e from qtdeclarative)
(backport of
d733f6a942e40e58ebc09f1d4414e2f8fa3f6a28 from qtquick1)
Change-Id: I261f0e957ffe3fc5fe42cd50672d2dd99b080f1e
Reviewed-by: Christopher Adams <chris.adams@jollamobile.com>
Reviewed-by: Alan Alpert <aalpert@rim.com>