Bug 1231500 - Fix a typo in the APZ axis locking code where the lock angle is used when the breakout angle is intended to be used. r=kats

--HG--
extra : source : e67a0ba7be6579eb808ec184b8ef0c00f804385b

gfx/layers/apz/src/AsyncPanZoomController.cpp

@@ -2219,7 +2219,7 @@ void AsyncPanZoomController::HandlePanningUpdate(const ScreenPoint& aPanDistance
           SetState(PANNING);
         }
       } else if (mState == PANNING_LOCKED_Y) {
-        if (!IsCloseToVertical(angle, gfxPrefs::APZAxisLockAngle())) {
+        if (!IsCloseToVertical(angle, gfxPrefs::APZAxisBreakoutAngle())) {
           mX.SetAxisLocked(false);
           SetState(PANNING);
         }