[uber] make the navigation controls an iframe

chrome/browser/resources/shared/css/chrome_shared2.css

Index: chrome/browser/resources/shared/css/chrome_shared2.css
diff --git a/chrome/browser/resources/shared/css/chrome_shared2.css b/chrome/browser/resources/shared/css/chrome_shared2.css
index beb780996b08a38526c0b7df6e8c53c34c534846..3210dcb916a6c0855e47b509203a1d2b94cfe43d 100644
--- a/chrome/browser/resources/shared/css/chrome_shared2.css
+++ b/chrome/browser/resources/shared/css/chrome_shared2.css
@@ -19,6 +19,10 @@ body {
   margin: 0;
 }
 
+body.uber-frame {
+  -webkit-margin-start: 155px;
+}
+
 p {
   line-height: 22px;
 }
@@ -97,23 +101,6 @@ html[dir='rtl'] .weakrtl input::-webkit-input-placeholder {
   direction: rtl;
 }
 
-.overlay {
-  -webkit-box-align: center;
-  -webkit-box-orient: vertical;
-  -webkit-box-pack: center;
-  -webkit-transition: 200ms opacity;
-  background-color: rgba(255, 255, 255, 0.75);
-  bottom: 0;
-  display: -webkit-box;
-  left: 0;
-  overflow: auto;
-  padding: 20px;
-  padding-bottom: 130px;
-  position: fixed;
-  right: 0;
-  top: 0;
-}
-
 /* TODO(estade): remove this: http://crbug.com/109967
  * For now it's a bandaid until we install open sans properly. */
 <if expr="not pp_ifdef('chromeos')">