Bug 1697863 - Use native menulist styling on some dialogs. r=harry

Differential Revision: https://phabricator.services.mozilla.com/D108101

browser/base/content/sanitize.xhtml

@@ -38,7 +38,7 @@
     <menulist id="sanitizeDurationChoice"
               preference="privacy.sanitize.timeSpan"
               onselect="gSanitizePromptDialog.selectByTimespan();"
-              flex="1">
+              flex="1" native="true">
       <menupopup id="sanitizeDurationPopup">
         <menuitem data-l10n-id="clear-time-duration-value-last-hour" value="1"/>
         <menuitem data-l10n-id="clear-time-duration-value-last-2-hours" value="2"/>

browser/components/shell/content/setDesktopBackground.xhtml

@@ -48,7 +48,7 @@
     <hbox align="center">
       <label data-l10n-id="set-background-position"/>
       <menulist id="menuPosition"
-                oncommand="gSetBackground.updatePosition();">
+                oncommand="gSetBackground.updatePosition();" native="true">
         <menupopup>
           <menuitem data-l10n-id="set-background-center"  value="CENTER"/>
           <menuitem data-l10n-id="set-background-tile"    value="TILE"/>

security/manager/pki/resources/content/clientauthask.xhtml

@@ -36,7 +36,7 @@
 <!-- The items in this menulist must never be sorted,
      but remain in the order filled by the application
 -->
-<menulist id="nicknames" oncommand="onCertSelected();">
+<menulist id="nicknames" oncommand="onCertSelected();" native="true">
     <menupopup/>
 </menulist>
 <description data-l10n-id="client-auth-cert-details"></description>

toolkit/mozapps/downloads/content/unknownContentType.xhtml

@@ -72,7 +72,7 @@
           <radio id="open" label="&openWith.label;" accesskey="&openWith.accesskey;"/>
           <deck id="modeDeck" flex="1">
             <hbox id="openHandlerBox" flex="1" align="center">
-              <menulist id="openHandler" flex="1">
+              <menulist id="openHandler" flex="1" native="true">
                 <menupopup id="openHandlerPopup" oncommand="dialog.openHandlerCommand();">
                   <menuitem id="defaultHandler" default="true" crop="right"/>
                   <menuitem id="otherHandler" hidden="true" crop="left"/>