Fix Find in Page on iOS 10.3.

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

Index: ios/chrome/browser/find_in_page/resources/find_in_page.js
diff --git a/ios/chrome/browser/find_in_page/resources/find_in_page.js b/ios/chrome/browser/find_in_page/resources/find_in_page.js
index 00fa1fd949660a706f8c302cc6c83ded266ebabe..735b808a9c851ecbc9822a9bfebc73d07a03faee 100644
--- a/ios/chrome/browser/find_in_page/resources/find_in_page.js
+++ b/ios/chrome/browser/find_in_page/resources/find_in_page.js
@@ -953,9 +953,13 @@ __gCrWeb['findInPage'].frameDocuments = function() {
   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.
       }
     }
   }