MD Settings: Touch up cr-dialog footers

chrome/browser/resources/settings/people_page/people_page.html

Index: chrome/browser/resources/settings/people_page/people_page.html
diff --git a/chrome/browser/resources/settings/people_page/people_page.html b/chrome/browser/resources/settings/people_page/people_page.html
index 59d922a114bfd38b621ad0eaa8b0746147104cb5..afcfbca9ab8c94957c19afb6c4670dfbaeec1d2e 100644
--- a/chrome/browser/resources/settings/people_page/people_page.html
+++ b/chrome/browser/resources/settings/people_page/people_page.html
@@ -94,7 +94,13 @@
         width: var(--iron-icon-width);
       }
 
-      .footer .settings-box {
+      #disconnectDialog .footer {
+        background-color: transparent;
+        /* TODO(dbeam): should this be a --settings-separator-line? */
+        border-top: 1px solid rgba(0, 0, 0, 0.14);

[tommycli, 2017/02/01 22:46:38]

Spreadsheet calls for 0.12 alpha, but this seems like it should be exactly the
same as top separator line defined here: 

https://cs.chromium.org/chromium/src/ui/webui/resources/cr_elements/cr_dialog...

Has same TODO question as top separator line, but i think we can address those
TODOs later together.

[Dan Beam, 2017/02/02 00:31:05]

aight, maybe --divider-color too

+      }
+
+      #disconnectDialog .footer .settings-box {
         --settings-box-row-padding: 0;
       }