[MD settings] css for row separator

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 1b42c6494755ecdbc3e90b3d2cafa56223a2cec1..b4f18e76b4ff42f662bc637abf2c24f1d0cc65b2 100644
--- a/chrome/browser/resources/settings/settings_shared_css.html
+++ b/chrome/browser/resources/settings/settings_shared_css.html
@@ -317,8 +317,8 @@
         outline: none;
       }
 
-      /* The secondary-action wraps a clickable sub-area of a .settings-box.
-       * An example is the |sign out| button on the People settings.
+      /* TODO(dschuyler): replace with .separator.
+       * The secondary-action wraps a clickable sub-area of a .settings-box.
        * Here is an example with and without a secondary action box:
        *
        *  +-------------------------------------------------------+
@@ -345,6 +345,24 @@
         border-top: var(--settings-separator-line);
       }
 
+      /* The separator a vertical line like a horizontal rule <hr> tag, but goes
+       * the other way. An example is near the |sign out| button on the People
+       * settings. */
+      :-webkit-any(.settings-box, .list-item) .separator {
+        -webkit-border-start: var(--settings-separator-line);
+        -webkit-margin-end: var(--settings-box-row-padding);
+        -webkit-margin-start: var(--settings-box-row-padding);
+        flex-shrink: 0;
+        --settings-separator-gaps: 9px;
+        height: calc(var(--settings-row-min-height) -
+            var(--settings-separator-gaps));
+      }
+
+      :-webkit-any(.settings-box, .list-item).two-line .separator {
+        height: calc(var(--settings-row-two-line-min-height) -
+            2 * var(--settings-separator-gaps));
+      }
+
       .settings-checkbox-spacer {
         -webkit-margin-start: calc(
             var(--checkbox-margin-start) +