Fix getItemId()

 Bug: 6446119

Change-Id: If8c13c9f2cb9b93c6f3575f12111059aeeacd5cb
diff --git a/src/com/android/browser/BrowserBookmarksAdapter.java b/src/com/android/browser/BrowserBookmarksAdapter.java
index 93cf5d9..afc28ba 100644
--- a/src/com/android/browser/BrowserBookmarksAdapter.java
+++ b/src/com/android/browser/BrowserBookmarksAdapter.java
@@ -49,6 +49,11 @@
     }
 
     @Override
+    protected long getItemId(Cursor c) {
+        return c.getLong(BookmarksLoader.COLUMN_INDEX_ID);
+    }
+
+    @Override
     public View newView(Context context, ViewGroup parent) {
         return mInflater.inflate(R.layout.bookmark_thumbnail, parent, false);
     }