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

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

Index: chrome/test/data/webui/md_bookmarks/reducers_test.js
diff --git a/chrome/test/data/webui/md_bookmarks/reducers_test.js b/chrome/test/data/webui/md_bookmarks/reducers_test.js
index 6e9c3dec69b29dcfc83b73d29710837b46e85e79..5054a8511c11b1211777d0e799b6617d08f2a7e3 100644
--- a/chrome/test/data/webui/md_bookmarks/reducers_test.js
+++ b/chrome/test/data/webui/md_bookmarks/reducers_test.js
@@ -78,6 +78,15 @@ suite('selection state', function() {
     state = bookmarks.SelectionState.updateSelection(state, action);
     assertDeepEquals({}, state.items);
   });
+
+  test('deselect items', function() {
+    action = select(['1', '2', '3'], '3', false);
+    state = bookmarks.SelectionState.updateSelection(state, action);
+
+    action = bookmarks.actions.deselectItems();
+    state = bookmarks.SelectionState.updateSelection(state, action);
+    assertDeepEquals({}, state.items);
+  });
 });
 
 suite('closed folder state', function() {