[MD settings] remove unwanted separator line

chrome/browser/resources/settings/settings_shared_css.html

Index: chrome/browser/resources/settings/settings_shared_css.html
diff --git a/chrome/browser/resources/settings/settings_shared_css.html b/chrome/browser/resources/settings/settings_shared_css.html
index 527f6aad801d0de170de753d20c97c76146f1be0..5c9d47770b7c0a4f42fc0cdf51519a2dccfa77d1 100644
--- a/chrome/browser/resources/settings/settings_shared_css.html
+++ b/chrome/browser/resources/settings/settings_shared_css.html
@@ -5,14 +5,6 @@
 <dom-module id="settings-shared">
   <template>
     <style include="cr-shared-style">
-      :host-context([dir=rtl]) button[is='paper-icon-button-light'] {
-        transform: scaleX(-1);  /* Flip on the X axis (aka mirror). */
-      }
-
-      :host-context([dir=rtl]) paper-icon-button[icon='settings:arrow-back'] {
-        transform: scaleX(-1);  /* Flip on the X axis (aka mirror). */
-      }
-
       /* Use <h2> as the "sub-header" mentioned in the UX design docs. */
       h2 {
         align-items: center;