DOMUI: Refactor the new overlay style and apply it to all overlays.

chrome/browser/resources/options/add_startup_page_overlay.html

Index: chrome/browser/resources/options/add_startup_page_overlay.html
diff --git a/chrome/browser/resources/options/add_startup_page_overlay.html b/chrome/browser/resources/options/add_startup_page_overlay.html
index 230c1a9e8929fca1b806c10c32d80b5c44ed4424..0655f7f9ee14725865dd3fe12e721512703aac57 100644
--- a/chrome/browser/resources/options/add_startup_page_overlay.html
+++ b/chrome/browser/resources/options/add_startup_page_overlay.html
@@ -1,18 +1,19 @@
 <div class="page hidden" id="addStartupPageOverlay">
   <h1 i18n-content="addStartupPageTitle"></h1>
-
   <form id="addStartupPageForm">
-    <label id="addURLBlock"><span
-        i18n-content="addStartupPageURLLabel"></span>
-      <input id="addStartupPageURL"></label>
-
-    <list id="addStartupRecentPageList"></list>
-
-    <div class="action-area button-strip">
-      <button type="reset"
-          i18n-content="addStartupPageCancelButton"></button>
-      <button type="submit" id="addStartupPageAddButton" disabled
-          i18n-content="addStartupPageAddButton"></button>
+    <div class="content-area">
+      <label id="addURLBlock"><span
+          i18n-content="addStartupPageURLLabel"></span>
+        <input type="url" id="addStartupPageURL"></label>
+      <list id="addStartupRecentPageList"></list>
+    </div>
+    <div class="action-area">
+      <div class="button-strip">
+        <button type="reset"
+            i18n-content="addStartupPageCancelButton"></button>
+        <button type="submit" id="addStartupPageAddButton" disabled
+            i18n-content="addStartupPageAddButton"></button>
+      </div>
     </div>
   </form>
 </div>