Fix for bug 199520. "file bookmark" window not painting all of the bookmark tree

r=neil, sr=jag

layout/xul/base/src/tree/src/nsTreeBodyFrame.cpp

@@ -453,7 +453,6 @@ nsTreeBodyFrame::GetMinSize(nsBoxLayoutState& aBoxLayoutState, nsSize& aSize)
     if (!rows.IsEmpty()) {
       PRInt32 err;
       desiredRows = rows.ToInteger(&err);
-      mHasFixedRowCount = PR_TRUE;
       mPageCount = desiredRows;
     }
     else {