Change the dev toggle in Extensions options page to use text-align instead of float so it mirrors...

chrome/browser/resources/options/extension_settings.css

 /*
 Copyright (c) 2011 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 */
 
 .details-view {
   -webkit-padding-end: 10px;
 }
 
@@ skipping 203 matching lines @@
 .extension-inspect-left-column {
   vertical-align: text-top;
 }
 
 /* Dev */
 
 .dev-open {
   border-bottom: 1px solid rgb(205, 205, 205);
   height: 32px;
   padding-bottom: 7px;
-  padding-top: 4px;
+  padding-top: 13px;
   -webkit-padding-start: 4px;
   -webkit-padding-end: 3px;
   -webkit-transition: padding 300ms, height 300ms, opacity 700ms;
 }
 .dev-closed {
   height: 0;
   opacity: 0;
+  padding-top: 9px;
   -webkit-padding-start: 4px;
   -webkit-padding-end: 3px;
   -webkit-transition: padding 300ms, height 700ms, opacity 200ms;
 }
 
 .dev-button-visible {
   display: inherit;
   opacity: 1;
   -webkit-transition: opacity 200ms;
 }
 
 .dev-button-hidden {
   display: none;
 }
 
 #suggest-gallery {
   -webkit-padding-start: 10px;
 }
 
 #dev-toggle {
   display: block;
-  float: right;
+  text-align: end;
   margin-top: -28px;
   -webkit-margin-end: 8px;
 }
 
 #get-more-extensions-container {
   display: -webkit-box;
 }
 
 #get-more-extensions {
   padding-top: 5px;
   font-size: 15px;
   -webkit-padding-start: 10px;
 }
 
 /* Support full keyboard accessibility without making things ugly
    for users who click, by hiding some focus outlines when the user
    clicks anywhere, but showing them when the user presses any key. */
 body.hide-some-focus-outlines .extension-zippy-container {
   outline: none;
 }