Resets the role assignments of the list and all its descendant object to those of the list's parent object.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
All descendant objects of the list on which this method is run will also now inherit from this list's parent, not just the immediate child objects.
We recommend that you carefully test code that uses this method to see the effect it has on descendant objects.
This method does nothing if the HasUniqueRoleAssignments property is false.
For more information about permission inheritance, see Fine-grained permission reference for SharePoint Server 2013.
Call Update() to commit any changes to the list before calling this method.