Remove dead code for system VK.

ui/keyboard/resources/elements/kb-altkey-container.html

Index: ui/keyboard/resources/elements/kb-altkey-container.html
diff --git a/ui/keyboard/resources/elements/kb-altkey-container.html b/ui/keyboard/resources/elements/kb-altkey-container.html
deleted file mode 100644
index 8ed1dc5886259d31b2f1521ad17bbd892c0c7366..0000000000000000000000000000000000000000
--- a/ui/keyboard/resources/elements/kb-altkey-container.html
+++ /dev/null
@@ -1,22 +0,0 @@
-<!--
-  -- Copyright 2013 The Chromium Authors. All rights reserved.
-  -- Use of this source code is governed by a BSD-style license that can be
-  -- found in the LICENSE file.
-  -->
-
-<polymer-element name="kb-altkey-container" attributes="keyset"
-    on-pointerup="{{up}}" on-pointerout="{{out}}">
-  <template>
-    <style>
-      :host {
-        -webkit-box-flex: 1;
-        bottom: 0;
-        left: 0;
-        position: absolute;
-        right: 0;
-        top: 0;
-      }
-    </style>
-    <content select="#{{keyset}}"></content>
-  </template>
-</polymer-element>