bug 1570292: browser: make remote control visual cue consistent; r=mak

When the browser session is remote controlled, a visual cue is
shown to the user by turning the background of the address bar
striped yellow.  This is to warn the user that it is not safe to
use this session for any sensitive browsing.

With the relatively recent addition of the tracking protection icon
to the far-most left of the address bar, the orange background is
broken off by the white background of the identities box.  This gives
a slight inconsistency when the browser is under remote controlled
(i.e. when --marionette is passed).

This patch removes the white background of the identities box so
that the striped orange background covers the entire surface of
the address bar.  This gives a slightly more coherent visual impression.

Differential Revision: https://phabricator.services.mozilla.com/D40037

--HG--
extra : moz-landing-system : lando

browser/base/content/browser.css

@@ -558,9 +558,6 @@ toolbar:not(#TabsToolbar) > #personal-bookmarks {
   background-color: rgba(255,170,68,.8);
   color: black;
 }
-:root[remotecontrol] #urlbar #identity-box {
-  background: white;
-}
 
 /* Show the url scheme in a static box when overflowing to the left */
 .urlbar-input-box {