Take care not to destroy a multi-selection when a child element of a list item receives focus.

chrome/browser/resources/options/deletable_item_list.js

Index: chrome/browser/resources/options/deletable_item_list.js
diff --git a/chrome/browser/resources/options/deletable_item_list.js b/chrome/browser/resources/options/deletable_item_list.js
index 4f223bad57802ee00c8472335ac9d6207863a788..ebb4517b9723da48f12293db1041ae1d99e20dd3 100644
--- a/chrome/browser/resources/options/deletable_item_list.js
+++ b/chrome/browser/resources/options/deletable_item_list.js
@@ -94,8 +94,15 @@ cr.define('options', function() {
     handleFocus_: function() {

[Dan Beam, 2014/07/30 19:05:34]

if (this.selected)
  return;

[engedy, 2014/07/31 09:35:48]

Done.

       var list = this.parentNode;
       var index = list.getIndexOfListItem(this);
-      list.selectionModel.selectedIndex = index;
-      list.selectionModel.anchorIndex = index;
+
+      // This handler is also fired when the child receives focus as a result of
+      // the item getting selected by the customized mouse/keyboard handling in
+      // SelectionController. Take care not to destroy a potential multiple
+      // selection in this case.
+      if (!this.selected) {
+        list.selectionModel.selectedIndex = index;
+        list.selectionModel.anchorIndex = index;
+      }
     },
 
     /**