[MD Bookmarks] Deselect items when clicking outside the bookmark card.

chrome/test/data/webui/md_bookmarks/list_test.js

Index: chrome/test/data/webui/md_bookmarks/list_test.js
diff --git a/chrome/test/data/webui/md_bookmarks/list_test.js b/chrome/test/data/webui/md_bookmarks/list_test.js
index 155f27761ecc8b8d72a1822611288926ccd85be5..4a3328704364fce5a7a2b0a84865fcefe87e3e90 100644
--- a/chrome/test/data/webui/md_bookmarks/list_test.js
+++ b/chrome/test/data/webui/md_bookmarks/list_test.js
@@ -80,4 +80,9 @@ suite('<bookmarks-list>', function() {
     assertEquals('3', store.lastAction.anchor);
     assertDeepEquals(['3'], store.lastAction.items);
   });
+
+  test('deselects items on click outside of card', function() {
+    customClick(list);
+    assertEquals('deselect-items', store.lastAction.name);
+  });
 });