[MD settings] add padding under title line in subpages

chrome/browser/resources/settings/settings_page/settings_subpage.html

Index: chrome/browser/resources/settings/settings_page/settings_subpage.html
diff --git a/chrome/browser/resources/settings/settings_page/settings_subpage.html b/chrome/browser/resources/settings/settings_page/settings_subpage.html
index 38dfd56ce4b1555e801bc13d29b1f7a27d8b6699..467d7b534f16b2bc6a773b199b5b0dcf1b1ee48b 100644
--- a/chrome/browser/resources/settings/settings_page/settings_subpage.html
+++ b/chrome/browser/resources/settings/settings_page/settings_subpage.html
@@ -20,6 +20,7 @@
 
       .settings-box.first {

[tommycli, 2017/03/30 20:35:08]

I assume this rule is only supposed to apply to that one div right? in that case
i'd suggest an id instead

[dschuyler, 2017/03/30 20:48:41]

Acknowledged.

[dschuyler, 2017/03/30 21:03:36]

See https://codereview.chromium.org/2787923002/

         min-height: 40px;
+        padding-bottom: 24px;
         padding-top: 8px;
       }