Added a better check for cross-origin iframes form parsing on iOS.

Iframes with empty "src" property can be cross-origin iframes, which
causes DOMException on some websites when the parsing is done.
Added a check for accessing frame's window.location.href parameter
which is a more trustworthy indicator.

Bug: 850388
Change-Id: Id644df4f3790e5ea5e3659964ccd96b378cd70d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066904
Commit-Queue: Maria Kazinova <kazinova@google.com>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745000}

components/password_manager/ios/resources/password_controller.js

@@ -69,9 +69,12 @@ const getSameOriginFrames = function(win) {
   const frames = win.document.getElementsByTagName('iframe');
   const result = [];
   for (let i = 0; i < frames.length; i++) {
-    if (!frames[i].src ||
-        __gCrWeb.common.isSameOrigin(win.location.href, frames[i].src)) {
-      result.push(frames[i].contentWindow);
+    try {
+      if (__gCrWeb.common.isSameOrigin(
+              win.location.href, frames[i].contentWindow.location.href)) {
+        result.push(frames[i].contentWindow);
+      }
+    } catch (e) {
     }
   }
   return result;