Implement V2 design for quiet safe browsing interstitial

components/security_interstitials/core/browser/resources/interstitial_common.js

 // Copyright 2017 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.
 
 // This is the shared code for security interstitials. It is used for both SSL
 // interstitials and Safe Browsing interstitials.
 
 // Should match security_interstitials::SecurityInterstitialCommands
 /** @enum| {string} */
 var SecurityInterstitialCommandId = {
   CMD_DONT_PROCEED: 0,
   CMD_PROCEED: 1,
   // Ways for user to get more information
   CMD_SHOW_MORE_SECTION: 2,
   CMD_OPEN_HELP_CENTER: 3,
   CMD_OPEN_DIAGNOSTIC: 4,
   // Primary button actions
   CMD_RELOAD: 5,
   CMD_OPEN_DATE_SETTINGS: 6,
   CMD_OPEN_LOGIN: 7,
   // Safe Browsing Extended Reporting
   CMD_DO_REPORT: 8,
   CMD_DONT_REPORT: 9,
   CMD_OPEN_REPORTING_PRIVACY: 10,
   CMD_OPEN_WHITEPAPER: 11,
   // Report a phishing error.
   CMD_REPORT_PHISHING_ERROR: 12
 };
 
+var HIDDEN_CLASS = 'hidden';
+
 /**
  * A convenience method for sending commands to the parent page.
  * @param {string} cmd  The command to send.
  */
 function sendCommand(cmd) {
 // <if expr="not is_ios">
   window.domAutomationController.setAutomationId(1);
   window.domAutomationController.send(cmd);
 // </if>
 // <if expr="is_ios">
   // TODO(crbug.com/565877): Revisit message passing for WKWebView.
   var iframe = document.createElement('IFRAME');
   iframe.setAttribute('src', 'js-command:' + cmd);
   document.documentElement.appendChild(iframe);
   iframe.parentNode.removeChild(iframe);
 // </if>
-}
+}
+
+/**
+ * Call this to stop clicks on <a href="#"> links from scrolling to the top of
+ * the page (and possibly showing a # in the link).
+ */
+function preventDefaultOnPoundLinkClicks() {
+  document.addEventListener('click', function(e) {
+    var anchor = findAncestor(/** @type {Node} */ (e.target), function(el) {
+      return el.tagName == 'A';
+    });
+    // Use getAttribute() to prevent URL normalization.
+    if (anchor && anchor.getAttribute('href') == '#')
+      e.preventDefault();
+  });
+}