Use PageManager in About page

chrome/browser/resources/options/options_page.css

Index: chrome/browser/resources/options/options_page.css
diff --git a/chrome/browser/resources/options/options_page.css b/chrome/browser/resources/options/options_page.css
index f8efff87805cad2997a51a495500624262ad2ec6..6607e9dbc619de41157389e352a8e209a2856efb 100644
--- a/chrome/browser/resources/options/options_page.css
+++ b/chrome/browser/resources/options/options_page.css
@@ -37,7 +37,7 @@ body {
   min-width: 600px;
 }
 
-body.uber-frame #searchBox {
+body #searchBox {
   position: fixed;
   z-index: 4;
 }
@@ -69,20 +69,6 @@ div.disabled {
   -webkit-box-flex: 1;
 }
 
-.frozen {
-  position: fixed;
-}
-
-#overlay-container-1 {
-  z-index: 11;
-}
-#overlay-container-2 {
-  z-index: 12;
-}
-#overlay-container-3 {
-  z-index: 13;
-}
-
 .raw-button,
 .raw-button:hover,
 .raw-button:active {
@@ -118,10 +104,6 @@ div.disabled {
   margin-top: 0;
 }
 
-.transparent {
-  opacity: 0;
-}
-
 .touch-slider {
   -webkit-appearance: slider-horizontal;
 }