Chrome Version: 64.0.3282.140 (Official Build) a06bc1d5e8e285c70078802de990c1719ccc75e8-refs/branch-heads/3282@{#631} 32/64-bit.
OS: Win(7,8,8.1, 10), Linux(14.04 LTS), Mac(10.9.5, 10.12.6, 10.13.1,10.13.2).

URL: http://csreis.github.io/tests/cross-site-iframe-simple.html

What steps will reproduce the problem?
1. Launch Chrome and navigate to above URL.
2. Type any texts in "WHAT, is your name" and "WHAT, is your email Address" text-box.
3. Right click on "WHAT, is your name" text box to open context menu, click on 'Undo' option and observe.

Texts of "WHAT, is your email Address" text-box gets undo instead of "WHAT, is your name" text-box.
Only texts of "WHAT, is your name" text-box should get undo.

This is a non-regression issue, seen from M-60 series.

NOTE: 
1. This issue is not reproducible on Fire-Fox browser.
2. This issue is also reproducible on M-64 Beta (build # 64.0.3282.119), M-65 Dev (build #65.0.3325.31) and M-66 Canary(build #66.0.3336.0).

Kindly review the attached screen-cast for reference.
 

Deleted: Actual behavior.mp4 879 KB

	Actual behavior.mp4 879 KB View Download

Deleted: Firefox_Expected.mp4 544 KB

	Firefox_Expected.mp4 544 KB View Download