UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36

Steps to reproduce the problem:
1. Run:

/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --user-data-dir="$PWD/Foo"

What is the expected behavior?
I shouldn't see the warning.

What went wrong?
2016-10-25 16:21:41.143 Google Chrome[7592:5079039] NSWindow warning: adding an unknown subview: <FullSizeContentView: 0x7f8723b7e920>. Break on NSLog to debug.
2016-10-25 16:21:41.143 Google Chrome[7592:5079039] Call stack:
(
    "+callStackSymbols disabled for performance reasons"
)

Did this work before? N/A 

Chrome version: 53.0.2785.143  Channel: n/a
OS Version: OS X 10.12.0
Flash Version: Shockwave Flash 23.0 r0

This happens when I run Chrome using a new profile, it says that it's adding an unknown subview and you should debug it on NSLog.

This happens all the time.