Implement new overlay style for options pages.

chrome/browser/resources/sync_setup_overlay.html

Index: chrome/browser/resources/sync_setup_overlay.html
diff --git a/chrome/browser/resources/sync_setup_overlay.html b/chrome/browser/resources/sync_setup_overlay.html
index fbb973b7f7ea256b0ca0150741bda5fa16a8e808..5d182b2855396f00d98e9323f8398ae7b981f7b0 100644
--- a/chrome/browser/resources/sync_setup_overlay.html
+++ b/chrome/browser/resources/sync_setup_overlay.html
@@ -11,6 +11,7 @@
     </div>
     <div class="sync-main-content">
       <div id="sync-setup-login-content-column">
+        <div class="close-button"></div>
         <h1 id="sync-setup-overlay-title" i18n-content="syncSetupOverlay"></h1>
         <div class="sign-in">
           <div id="top-blurb-error" class="reset-hidden" hidden>
@@ -195,6 +196,7 @@
       </div>
     </div>
     <div id="customize-sync-preferences" hidden>
+      <div class="close-button"></div>
       <h1 i18n-content="syncSetupConfigureTitle"></h1>
       <form id="choose-data-types-form">
         <div id="sync-configure-content" class="content-area">
@@ -384,6 +386,7 @@
     </div>
   </div>
   <div id="sync-setup-stop-syncing" hidden>
+    <div class="close-button"></div>
     <h1 i18n-content="stopSyncingTitle"></h1>
     <div class="content-area">
       <span i18n-values=".innerHTML:stopSyncingExplanation"></span>