Clear recents folder when changing account

 Bug: 4971707

Change-Id: I20fa1fdbf0f832af0b36c81ebba17decbc9a5811
diff --git a/src/com/android/browser/AddBookmarkPage.java b/src/com/android/browser/AddBookmarkPage.java
index f330cd5..32db550 100644
--- a/src/com/android/browser/AddBookmarkPage.java
+++ b/src/com/android/browser/AddBookmarkPage.java
@@ -959,6 +959,7 @@
             long root = mAccountAdapter.getItem(position).rootFolderId;
             if (root != mRootFolder) {
                 onRootFolderFound(root);
+                mFolderAdapter.clearRecentFolder();
             }
         }
     }