Bug 1438470 - Port bug 1437654 to mailnews: Remove call to nsITreeBoxObject::SetView(). rs=bustage-fix

mailnews/addrbook/src/nsAbView.cpp

@@ -59,8 +59,6 @@ NS_IMETHODIMP nsAbView::ClearView()
 {
   mDirectory = nullptr;
   mAbViewListener = nullptr;
-  if (mTree)
-    mTree->SetView(nullptr);
   mTree = nullptr;
   mTreeSelection = nullptr;
 
@@ -171,7 +169,6 @@ NS_IMETHODIMP nsAbView::SetView(nsIAbDirectory *aAddressBook,
   {
     // Try and speed deletion of old cards by disconnecting the tree from us.
     mTreeSelection->ClearSelection();
-    mTree->SetView(nullptr);
   }
 
   // Clear out old cards