Fix Find in Page on iOS 10.3.

ios/chrome/browser/find_in_page/resources/find_in_page.js

 // Copyright 2012 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.
 
 /**
  * Based heavily on code from the Google iOS app.
  *
  * @fileoverview A find in page tool.  It scans the DOM for elements with the
  * text being search for, and wraps them with a span that highlights them.
  */
@@ skipping 935 matching lines @@
 /**
  * Gather all iframes in the main window.
  * @return {Array<Document>} frames.
  */
 __gCrWeb['findInPage'].frameDocuments = function() {
   var windowsToSearch = [window];
   var documents = [];
   while (windowsToSearch.length != 0) {
     var win = windowsToSearch.pop();
     for (var i = win.frames.length - 1; i >= 0; i--) {
-      if (win.frames[i].document) {
-        documents.push(win.frames[i].document);
-        windowsToSearch.push(win.frames[i]);
+      try{

[justincohen, 2017/03/17 15:05:34]

nit space

[stkhapugin, 2017/03/17 15:20:51]

Done.

+        if (win.frames[i].document) {
+          documents.push(win.frames[i].document);
+          windowsToSearch.push(win.frames[i]);
+        }
+      } catch (e) {

[justincohen, 2017/03/17 15:06:25]

probably best to explain what we expect to catch here, and why it's ok to ignore
it.

[stkhapugin, 2017/03/17 15:20:51]

Done.

+        // Do nothing.
       }
     }
   }
   return documents;
 };
 
 window.addEventListener('pagehide', __gCrWeb['findInPage']['disable']);