Sync Promo: Add a way to collapse the sync promo

chrome/browser/resources/options/options.html

Index: chrome/browser/resources/options/options.html
diff --git a/chrome/browser/resources/options/options.html b/chrome/browser/resources/options/options.html
index 9acb99a7d2efff720d71e8d3119ec41f464c13ef..d48cbd84bee4b6b54b1e36034159832ea09a3cc0 100644
--- a/chrome/browser/resources/options/options.html
+++ b/chrome/browser/resources/options/options.html
@@ -39,7 +39,7 @@
 <link rel="stylesheet" href="search_engine_manager.css">
 <link rel="stylesheet" href="search_page.css">
 <link rel="stylesheet" href="subpages_tab_controls.css">
-<link rel="stylesheet" href="sync_setup_overlay.css">
+<link rel="stylesheet" href="../sync_setup_overlay.css">
 <if expr="pp_ifdef('chromeos')">
   <link rel="stylesheet" href="about_page.css">
   <link rel="stylesheet" href="chromeos/accounts_options_page.css">
@@ -82,7 +82,7 @@
   <include src="import_data_overlay.html">
   <include src="instant_confirm_overlay.html">
   <include src="language_add_language_overlay.html">
-  <include src="sync_setup_overlay.html">
+  <include src="../sync_setup_overlay.html">
   <if expr="pp_ifdef('chromeos')">
      <include
          src="chromeos/language_customize_modifier_keys_overlay.html">