Bug 1606930 - Unify address bar focus border across platforms. r=dao

Differential Revision: https://phabricator.services.mozilla.com/D59513

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

browser/themes/osx/browser.css

@@ -256,18 +256,11 @@
 
 /* Focus ring. */
 #urlbar:not(.megabar)[focused="true"],
-#urlbar.megabar[focused="true"] > #urlbar-background,
 #searchbar:focus-within {
   box-shadow: 0 0 0 1px var(--toolbar-field-focus-border-color) inset,
               0 0 0 1px var(--toolbar-field-focus-border-color);
 }
 
-#urlbar.megabar[breakout][breakout-extend][focused="true"] > #urlbar-background {
-  box-shadow: 0 0 0 1px var(--toolbar-field-focus-border-color) inset,
-              0 0 0 1px var(--toolbar-field-focus-border-color),
-              0 5px 18px rgba(0, 0, 0, .2);
-}
-
 %include ../shared/identity-block/identity-block.inc.css
 
 #pageAction-urlbar-shareURL,