loplugin:unnecessaryoverride (dtors) in slideshow

Change-Id: I5c4bc26bc51347e453ce69913edc52cf1f1aa821

slideshow/source/engine/effectrewinder.cxx

@@ -43,7 +43,7 @@ class RewinderEventHandler : public EventHandler
 public:
     typedef ::std::function<bool ()> Action;
     explicit RewinderEventHandler (const Action& rAction) : maAction(rAction) {}
-    virtual ~RewinderEventHandler() override {}
+
 private:
     const Action maAction;
     virtual bool handleEvent() override { return maAction(); }
@@ -55,7 +55,7 @@ class RewinderAnimationEventHandler : public AnimationEventHandler
 public:
     typedef ::std::function<bool (const AnimationNodeSharedPtr& rpNode)> Action;
     explicit RewinderAnimationEventHandler (const Action& rAction) : maAction(rAction) {}
-    virtual ~RewinderAnimationEventHandler() override {}
+
 private:
     const Action maAction;
     virtual bool handleAnimationEvent (const AnimationNodeSharedPtr& rpNode) override

slideshow/source/engine/shapes/drawinglayeranimation.cxx

@@ -131,8 +131,6 @@ double ScrollTextAnimNode::GetStateAtRelativeTime(
 class ActivityImpl : public Activity
 {
 public:
-    virtual ~ActivityImpl() override;
-
     ActivityImpl(
         SlideShowContext const& rContext,
         std::shared_ptr<WakeupEvent> const& pWakeupEvent,
@@ -849,10 +847,6 @@ bool ActivityImpl::enableAnimations()
     return maContext.mrActivitiesQueue.addActivity( std::dynamic_pointer_cast<Activity>(shared_from_this()) );
 }
 
-ActivityImpl::~ActivityImpl()
-{
-}
-
 void ActivityImpl::dispose()
 {
     if( !mbIsDisposed )