Bug 1348322 - Fix the initial values of gVelocityCurveFunction. r=kats

MozReview-Commit-ID: LDWCeRC4JBH

--HG--
extra : rebase_source : 3937add42e185d9c29f86d8626bb65e7172dcdd1

gfx/layers/apz/src/AsyncPanZoomController.cpp

@@ -679,7 +679,7 @@ AsyncPanZoomController::InitializeGlobalState()
   gVelocityCurveFunction = new ComputedTimingFunction();
   gVelocityCurveFunction->Init(
     nsTimingFunction(gfxPrefs::APZCurveFunctionX1(),
-                     gfxPrefs::APZCurveFunctionY2(),
+                     gfxPrefs::APZCurveFunctionY1(),
                      gfxPrefs::APZCurveFunctionX2(),
                      gfxPrefs::APZCurveFunctionY2()));
   ClearOnShutdown(&gVelocityCurveFunction);