Close the bookmarks cursor.

If no touch icon loader is created, close the cursor immediately. Close the
cursor in doInBackground to ensure that the cursor is closed even in error.

Bug: 2483029
diff --git a/src/com/android/browser/Tab.java b/src/com/android/browser/Tab.java
index 7e03bbc..7b54e38 100644
--- a/src/com/android/browser/Tab.java
+++ b/src/com/android/browser/Tab.java
@@ -975,6 +975,8 @@
                         mTouchIconLoader = new DownloadTouchIcon(Tab.this, cr,
                                 c, view);
                         mTouchIconLoader.execute(url);
+                    } else {
+                        c.close();
                     }
                 } else {
                     c.close();