Fix schemes that can be downloaded

Change-Id: I4a2b75a6ce923e7176f4f0b17fbaae5b1c5ef543
diff --git a/src/com/android/browser/Controller.java b/src/com/android/browser/Controller.java
index 1d535a4..406c73c 100644
--- a/src/com/android/browser/Controller.java
+++ b/src/com/android/browser/Controller.java
@@ -1462,6 +1462,8 @@
             menu.setGroupVisible(R.id.ANCHOR_MENU,
                     type == WebView.HitTestResult.SRC_ANCHOR_TYPE
                             || type == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE);
+            menu.findItem(R.id.save_link_context_menu_id).setEnabled(
+                UrlUtils.isDownloadableScheme(extra));
         }
         // Setup custom handling depending on the type
         switch (type) {