FolderColumns implements BaseColumns

Change-Id: I913b1bfe7abeb8a941bfc38c7a8d2061f8ba25e3
diff --git a/src/com/android/mail/providers/UIProvider.java b/src/com/android/mail/providers/UIProvider.java
index 2b43c18..ecc32c9 100644
--- a/src/com/android/mail/providers/UIProvider.java
+++ b/src/com/android/mail/providers/UIProvider.java
@@ -683,7 +683,7 @@
             "vnd.android.cursor.item/vnd.com.android.mail.folder";
 
     public static final String[] FOLDERS_PROJECTION = {
-        BaseColumns._ID,
+        FolderColumns._ID,
         FolderColumns.PERSISTENT_ID,
         FolderColumns.URI,
         FolderColumns.NAME,
@@ -849,7 +849,7 @@
         public static final int ALLOWS_MOVE_TO_INBOX = 0x10000;
     }
 
-    public static final class FolderColumns {
+    public static final class FolderColumns implements BaseColumns {
         /**
          * This string column contains an id for the folder that is constant across devices, or
          * null if there is no constant id.