Known networks: fix network list alignment

Bug: 804686
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ia6d56e8640ad946ca9e2b25629fac4f04fae7a1f
Reviewed-on: https://chromium-review.googlesource.com/954349Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541814}

chrome/browser/resources/settings/internet_page/internet_known_networks_page.html

@@ -28,7 +28,7 @@
       <template is="dom-repeat" items="[[networkStateList_]]"
           filter="networkIsPreferred_">
         <div class="list-item">
-          <div actionable class="flex layout horizontal"
+          <div actionable class="flex layout horizontal center"
               on-click="fireShowDetails_">
             <div class="flex">[[item.Name]]</div>
             <template is="dom-if" if="[[isPolicySource(item.Source))]]">
@@ -58,7 +58,7 @@
       <template is="dom-repeat" items="[[networkStateList_]]"
           filter="networkIsNotPreferred_">
         <div class="list-item">
-          <div actionable class="flex layout horizontal"
+          <div actionable class="flex layout horizontal center"
               on-click="fireShowDetails_">
             <div class="flex">[[item.Name]]</div>
             <template is="dom-if" if="[[isPolicySource(item.Source))]]">