To add:- I see that Chrome now makes an initial POST request (Request 1) with the correct content, but then makes a GET request (Request 2) once again with the content.

Deleted: request 1.jpg 80.1 KB

	request 1.jpg 80.1 KB View Download

Deleted: request 2.jpg 86.2 KB

	request 2.jpg 86.2 KB View Download

This is not a problem with the headers. Rather it is a problem that Chrome is sending content in a GET request type.
See https://stackoverflow.com/questions/978061/http-get-with-request-body

Tried testing the issue on reported chrome #72.0.3626.64 using Windows 10 by following below steps.

Steps:
=====
1.Launched chrome.
2.Navigated to "amazon.in" and signed into the account.
3.Opened Devtools->Network tab.
4.Opened a request that has "Request Method" as GET.
5.Opened Headers and observed the "Content-Length" and "Content-Type".
6.Followed the above steps on chrome version #71.0.3578.98, the same behaviour is seen.
Note: "https://online.lloydsbank.co.uk/personal/logon/login.jsp", as the link is related to internet banking could not check the issue using this link, hence used "amazon.in" for testing.

Attached screenshots for reference.
@reporter: Could you please review the above steps followed and screenshots and let us know if anything is missed from our end. Requesting you to provide any other URL that reproduces the issue so that it would be really helpful in triaging the issue further.
Thanks.!

Deleted: 923908_M71.png 1.0 MB

	923908_M71.png 1.0 MB View Download

Deleted: 923908_M72.png 1.0 MB

	923908_M72.png 1.0 MB View Download

After investigating, the problem is related to  issue 923622 .

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot