Limit the height of the offline omnibox divider.

chrome/android/java/res/layout/location_bar_status.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2016 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. -->
 
 <!-- The location bar verbose status. -->
 <merge xmlns:android="http://schemas.android.com/apk/res/android">
 
      <TextView android:id="@+id/location_bar_verbose_status"
         android:layout_width="wrap_content"
         android:layout_height="match_parent"
         android:paddingEnd="8dp"
         android:gravity="center_vertical"
         android:textAlignment="viewStart"
         android:textAppearance="@android:style/TextAppearance.Medium"
         android:textColor="@color/locationbar_status_color"
         android:textSize="@dimen/location_bar_url_text_size"
         android:text="@string/location_bar_verbose_status_offline"
         android:visibility="gone" />
 
     <!-- Separator is going to be shown or hidden together with the status defined above. -->
     <View android:id="@+id/location_bar_verbose_status_separator"
         android:layout_width="@dimen/location_bar_status_separator_width"
-        android:layout_height="match_parent"
-        android:layout_marginTop="8dp"
-        android:layout_marginBottom="8dp"
+        android:layout_height="24dp"
+        android:layout_gravity="center_vertical"
         android:background="#1f000000"
         android:visibility="gone" />
 
     <!-- This space follows the verbose status and compliments the space that follows
          the status. -->
     <Space android:id="@+id/location_bar_verbose_status_extra_space"
         android:layout_width="8dp"
         android:layout_height="match_parent"
         android:visibility="gone" />
 
 </merge>