Close the permission bubble when use clicks 'esc'

BUG=385088

Review URL: https://codereview.chromium.org/882873002

Cr-Commit-Position: refs/heads/master@{#313510}

chrome/browser/ui/views/website_settings/permissions_bubble_view.cc

@@ -226,7 +226,7 @@ PermissionsBubbleDelegateView::PermissionsBubbleDelegateView(
 
   RemoveAllChildViews(true);
   customize_comboboxes_.clear();
-  set_close_on_esc(false);
+  set_close_on_esc(true);
   set_close_on_deactivate(false);
 
   SetLayoutManager(new views::BoxLayout(