MD Settings: add borders between toggle rows on basic/advanced pages

chrome/browser/resources/settings/system_page/system_page.html

Index: chrome/browser/resources/settings/system_page/system_page.html
diff --git a/chrome/browser/resources/settings/system_page/system_page.html b/chrome/browser/resources/settings/system_page/system_page.html
index db416e60a3991fdc130d50f1525c9d6dbdc2279e..701814741f17e53bb9e8872f7aa96881cc39872c 100644
--- a/chrome/browser/resources/settings/system_page/system_page.html
+++ b/chrome/browser/resources/settings/system_page/system_page.html
@@ -1,5 +1,4 @@
 <link rel="import" href="chrome://resources/html/polymer.html">
-<link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout-classes.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="/controls/controlled_button.html">
 <link rel="import" href="/controls/extension_controlled_indicator.html">
@@ -12,14 +11,16 @@
 <dom-module id="settings-system-page">
   <template>
     <style include="settings-shared"></style>
-    <div class="settings-box block first">
+    <div class="settings-box first">
 <if expr="not is_macosx">
-      <settings-toggle-button
+      <settings-toggle-button class="start"
           pref="{{prefs.background_mode.enabled}}"
           label="$i18n{backgroundAppsLabel}">
       </settings-toggle-button>
+    </div>
+    <div class="settings-box">
 </if>
-      <settings-toggle-button class="flex" id="hardwareAcceleration"
+      <settings-toggle-button class="start" id="hardwareAcceleration"
           pref="{{prefs.hardware_acceleration_mode.enabled}}"
           label="$i18n{hardwareAccelerationLabel}">
         <template is="dom-if" if="[[shouldShowRestart_(