UserAgent: Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36

Steps to reproduce the problem:
1. Start Chrome and, connect to www.naver.com
2. Open another tab and, go to Accessibility setting page(chrome://accessibility)
3. View the accessibility tree of the test page(www.naver.com)
4. Check the value property of system document accessible object(ROLE_SYSTEM_DOCUMENT) which consist of the page

What is the expected behavior?
The value property of system document accessible object(ROLE_SYSTEM_DOCUMENT) should be the URL of its frame's address

What went wrong?
The value property always represents its top frame's address

Did this work before? Yes until v47

Chrome version: 47.0.2526.106  Channel: n/a
OS Version: 10.0
Flash Version: Shockwave Flash 21.0 r0

v47 : works
v48 : doesn't work
v49 : doesn't work