Settings: Bring Appearance section in line with mocks.

chrome/browser/resources/options2/browser_options_page.css

 /* TODO(csilv): Re-order, rename selectors according to style guide. */
 /* TODO(csilv): Rename this file 'browser_options.css' */
 
 /* This is necessary because the fix for correctly wrapping labels
  * (crbug.com/109334) requires labels to be display: block; however, this label
  * has a button inline after it.
  */
 #home-page-label {
   display: inline;
 }
@@ skipping 89 matching lines @@
   height: 31px;
   padding: 3px;
   vertical-align: middle;
   width: 38px;
 }
 
 .profile-item-current {
   font-weight: bold;
 }
 
-#themes-gallery-div {
-  margin: 10px 0;
-}
-
 .sync-error {
   background: #FFDBDB;
   border: 1px solid #ce4c4c;
   border-radius: 2px;
   padding: 10px;
 }
 
 .sync-error .link-button {
   margin: 0 1ex;
   padding: 0;
 }
 
 #enable-auto-login-checkbox {
   margin-top: 10px;
 }
 
 #mac-passwords-warning,
 #manage-data-group {
   margin-top: 10px;
 }