Don't allow elevation for CHROME_OS.

chrome/browser/resources/managed_mode_block_interstitial.html

Index: chrome/browser/resources/managed_mode_block_interstitial.html
diff --git a/chrome/browser/resources/managed_mode_block_interstitial.html b/chrome/browser/resources/managed_mode_block_interstitial.html
index 6fff8b5000b3414c65a6db8565debd14542c5608..2f7471b14daa54aaf1b4c8944c1c6ac7174f8b1c 100644
--- a/chrome/browser/resources/managed_mode_block_interstitial.html
+++ b/chrome/browser/resources/managed_mode_block_interstitial.html
@@ -4,6 +4,7 @@
   <title i18n-content="blockPageTitle"></title>
   <link rel="stylesheet" href="../../../ui/webui/resources/css/chrome_shared.css">
   <link rel="stylesheet" href="managed_mode_block_interstitial.css">
+  <script src="../../../ui/webui/resources/js/cr.js"></script>
   <script src="../../../ui/webui/resources/js/load_time_data.js"></script>
   <script src="../../../ui/webui/resources/js/util.js"></script>
   <script src="managed_mode_block_interstitial.js"></script>
@@ -20,9 +21,12 @@
             i18n-content="contentPacksSectionButton" disabled>
     </button>
   </div>
-  <div id="footer-message">
-    <span id="bypass-block-message" i18n-content="bypassBlockMessage"></span>
-    <button id="bypass-block-button" i18n-content="bypassBlockButton"></button>
-  </div>
+  <if expr="not pp_ifdef('chromeos')">
+    <div id="footer-message">
+      <span id="bypass-block-message" i18n-content="bypassBlockMessage"></span>
+      <button id="bypass-block-button" i18n-content="bypassBlockButton">
+      </button>
+    </div>
+  </if>
 </body>
 </html>