CrOS "remove this user" button should use red button style just like desktop browser

ui/login/account_picker/user_pod_template.html

Index: ui/login/account_picker/user_pod_template.html
diff --git a/ui/login/account_picker/user_pod_template.html b/ui/login/account_picker/user_pod_template.html
index 8bcbce1e3e8a67b39438205e2a630befe6c8a911..2154f50a5880cc2333165e43e3f1061c8d9900ff 100644
--- a/ui/login/account_picker/user_pod_template.html
+++ b/ui/login/account_picker/user_pod_template.html
@@ -1,3 +1,18 @@
+<style is="custom-style">

[Alexander Alekseev, 2016/08/31 00:52:29]

Please, move this style to a .css file. Our presubmit hooks are unable to
analyze inlined css yet.

[Qiang(Joe) Xu, 2016/08/31 05:02:25]

done per discussion

+  .action-box-remove-user-warning .remove-warning-button {
+    --paper-button: {
+      background: var(--google-red-700);
+      color: white;
+      font-weight: 600;
+      @apply(--layout-vertical);
+    };
+    --paper-button-flat-keyboard-focus: {
+      background: rgb(173, 50, 36);
+    };
+    @apply(--action-button);
+  }
+</style>
+
 <div id="user-pod-template" class="pod disabled" hidden>
   <div class="user-image-pane pin-tag">
     <div class="user-image-container">