oneliners: allow ulrbar-container to shrink a bit

This fixes a problem where urlbar would cause items in the toolbar to
overflow the whole toolbar too early

chrome/navbar_tabs_responsive_oneliner.css

@@ -31,7 +31,10 @@ See the above repository for updates as well as full license text. */
 /* prevent urlbar overflow on narrow windows */
 /* Dependent on how many items are in navigation toolbar ADJUST AS NEEDED */
   @media screen and (max-width: 1500px){
-    #urlbar-container{ min-width:unset !important }
+    #urlbar-container{
+      min-width: 300px !important;
+      flex-shrink: 1 !important;
+    }
   }
 
   /* Override for other densities */