[Multi Profile] Double-clicking an item in the user list should edit that profile.

chrome/browser/resources/options/personal_options_profile_list.js

Index: chrome/browser/resources/options/personal_options_profile_list.js
diff --git a/chrome/browser/resources/options/personal_options_profile_list.js b/chrome/browser/resources/options/personal_options_profile_list.js
index a27f04e751278a91258ec0b650a60a1b30f023c0..0b67df08785b8a219224bd96c82cdafff763ed93 100644
--- a/chrome/browser/resources/options/personal_options_profile_list.js
+++ b/chrome/browser/resources/options/personal_options_profile_list.js
@@ -83,6 +83,11 @@ cr.define('options.personal_options', function() {
     deleteItemAtIndex: function(index) {
       ManageProfileOverlay.showDeleteDialog(this.dataModel.item(index));
     },
+
+    /** @inheritDoc */
+    activateItemAtIndex: function(index) {
+      ManageProfileOverlay.showManageDialog(this.dataModel.item(index));
+    },
   };
 
   return {