MD Settings: Preserve search URL param in subpages.

chrome/browser/resources/settings/settings_menu/settings_menu.js

Index: chrome/browser/resources/settings/settings_menu/settings_menu.js
diff --git a/chrome/browser/resources/settings/settings_menu/settings_menu.js b/chrome/browser/resources/settings/settings_menu/settings_menu.js
index fb672628d46bb92741caafc2dc76d93df4dba12f..d95c4f004deca2e46f2add77a046bb25f509af8c 100644
--- a/chrome/browser/resources/settings/settings_menu/settings_menu.js
+++ b/chrome/browser/resources/settings/settings_menu/settings_menu.js
@@ -75,7 +75,7 @@ Polymer({
   openPage_: function(event) {
     var route = settings.getRouteForPath(event.currentTarget.dataset.path);
     assert(route, 'settings-menu has an an entry with an invalid path');
-    settings.navigateTo(route);
+    settings.navigateTo(route, null, false);

[dschuyler, 2016/11/09 23:10:14]

I find null, false unclear. Could we do

settings.navigateTo(route, /*dynamicParams*/null, /*preserveSearch*/false);

or 

settings.navigateTo(route, new URLSearchParams(), /*preserveSearch*/false);

[dpapad, 2016/11/09 23:19:16]

Done.

   },
 
   /**