Remove: Unnecessary virtual destructors on drop down list items.

src/toolbar_gui.cpp

@@ -97,8 +97,6 @@ public:
 		this->checkmark_width = GetStringBoundingBox(STR_JUST_CHECKMARK).width + 3;
 	}
 
-	virtual ~DropDownListCheckedItem() {}
-
 	uint Width() const
 	{
 		return DropDownListStringItem::Width() + this->checkmark_width;
@@ -129,8 +127,6 @@ public:
 		this->lock_size = GetSpriteSize(SPR_LOCK);
 	}
 
-	virtual ~DropDownListCompanyItem() {}
-
 	bool Selectable() const
 	{
 		return true;