[banshee] Dap: remove unused variable in RemovableSource

[Andrés Aragoneses <aaragoneses src gnome org>]

commit 658719029e775015f4fae96aceca637d871dbddd
Author: Nicholas Little <arealityfarbetween googlemail com>
Date:   Thu Jul 17 22:32:23 2014 +0200

    Dap: remove unused variable in RemovableSource
    
    The sync variable in RemovableSource was only used in a not operation in
    the CanUnmap property. This patch removes the unused variable and marks
    the property as virtual for subclasses to override.

 src/Dap/Banshee.Dap/Banshee.Dap/RemovableSource.cs |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/src/Dap/Banshee.Dap/Banshee.Dap/RemovableSource.cs 
b/src/Dap/Banshee.Dap/Banshee.Dap/RemovableSource.cs
index 226c0c0..30d394e 100644
--- a/src/Dap/Banshee.Dap/Banshee.Dap/RemovableSource.cs
+++ b/src/Dap/Banshee.Dap/Banshee.Dap/RemovableSource.cs
@@ -130,9 +130,8 @@ namespace Banshee.Dap
             return (source is DatabaseSource) && this != source.Parent && !IsReadOnly;
         }
 
-        private bool syncing = false;
-        public bool CanUnmap {
-            get { return !syncing; }
+        public virtual bool CanUnmap {
+            get { return true; }
         }
 
         public bool ConfirmBeforeUnmap {