On tapping the disabled option in context menu should not close the menu

In the context menu, disabled items are not required so can be removed
instead of disabling them, so user donot tap on it.

BUG=395551

Review URL: https://codereview.chromium.org/494093003

Cr-Commit-Position: refs/heads/master@{#291861}

AUTHORS

@@ -102,6 +102,7 @@ Derek Halman <d.halman@gmail.com>
 Devlin Cronin <rdevlin.cronin@gmail.com>
 Diego Ferreiro Val <elfogris@gmail.com>
 Dillon Sellars <dill.sellars@gmail.com>
+Divya Bansal <divya.bansal@samsung.com>
 Dominic Jodoin <dominic.jodoin@gmail.com>
 Dominik Röttsches <dominik.rottsches@intel.com>
 Don Woodward <woodward@adobe.com>

chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java

@@ -58,14 +58,14 @@ public class ChromeContextMenuPopulator implements ContextMenuPopulator {
             menu.findItem(R.id.contextmenu_copy_link_text).setVisible(false);
         }
 
-        menu.findItem(R.id.contextmenu_save_link_as).setEnabled(
+        menu.findItem(R.id.contextmenu_save_link_as).setVisible(
                 UrlUtilities.isDownloadableScheme(params.getLinkUrl()));
 
         if (params.isVideo()) {
-            menu.findItem(R.id.contextmenu_save_video).setEnabled(
+            menu.findItem(R.id.contextmenu_save_video).setVisible(
                     UrlUtilities.isDownloadableScheme(params.getSrcUrl()));
         } else if (params.isImage()) {
-            menu.findItem(R.id.contextmenu_save_image).setEnabled(
+            menu.findItem(R.id.contextmenu_save_image).setVisible(
                     UrlUtilities.isDownloadableScheme(params.getSrcUrl()));
 
             if (mDelegate.canLoadOriginalImage()) {