Possible related:  issue 714373 

Able to reproduce the issue on Windows 7, Mac 10.12.4 & Ubuntu 14.04 using chrome latest Canary-61.0.3123.0 & reported version-61.0.3122.0  as per the above html file.

Observed "download.txt" file get downloaded instead of "some.txt" after clicking 'Download some.txt' link.

jochen@,
Seems this issue is similar to #714373. Could you please confirm to proceed further to provide bisect or to duplicate the issue.
Thanks.

Able to reproduce the issue on Windows 7, Mac 10.12.4 & Ubuntu 14.04 using chrome latest Canary-61.0.3123.0
Manual Bisect:
--------------
Good-60.0.3106.0-Revision-473419
Bad-60.0.3107.0-Revision-473482

Per-revision-bisect info:
-------------------------
You are probably looking for a change made after 473427 (known good), but no later than 473428 (first known bad).
CHANGELOG URL:
The script might not always return single CL as suspectas some perf builds might get missing due to failure.
https://chromium.googlesource.com/chromium/src/+log/dcc699ff151393a7d2fa29314befd57d194b0f60..aa36b98fa1c1df77968137cf73dd3244c4559a4e

jochen@ Please take a look into this issue.

Thanks.

This bug requires manual review: M60 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), josafat@(ChromeOS), bustamante@(Desktop)

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

hi jochen@ - have you already confirmed this fix in canary?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e09ad54e01d9a94d9bc0480ed7f696f2ca188143

commit e09ad54e01d9a94d9bc0480ed7f696f2ca188143
Author: Jochen Eisinger <jochen@chromium.org>
Date: Mon Jun 12 15:50:33 2017

Don't consider about: and data: as cross origin downloads

Bug:  730050 
Change-Id: Ia11ab0e17995339fa2a620837a0bbb29b789512a
Reviewed-on: https://chromium-review.googlesource.com/528235
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478638}
[modify] https://crrev.com/e09ad54e01d9a94d9bc0480ed7f696f2ca188143/content/browser/download/download_request_core.cc

Eh, sorry, the cl only landed now... Will ping again after confirming canary

Verified the fix on Mac 10.12.5, Win-10 and Ubuntu 14.04 using Chrome dev version #61.0.3135.4 as per the comment #0.
Attaching screen cast for reference.
Observed that some.txt file downloaded.
Hence, the fix is working as expected. 
Adding the verified labels.

Thanks...!!

Deleted: 730050.mp4 620 KB

	730050.mp4 620 KB View Download

This bug requires manual review: M60 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), josafat@(ChromeOS), bustamante@(Desktop)

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

Approving merge to M60. 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/260c644d232118eea29ef51197fb668545da72b4

commit 260c644d232118eea29ef51197fb668545da72b4
Author: Jochen Eisinger <jochen@chromium.org>
Date: Tue Jun 27 07:36:22 2017

Don't consider about: and data: as cross origin downloads

TBR=jochen@chromium.org

(cherry picked from commit e09ad54e01d9a94d9bc0480ed7f696f2ca188143)

Bug:  730050 
Change-Id: Ia11ab0e17995339fa2a620837a0bbb29b789512a
Reviewed-on: https://chromium-review.googlesource.com/528235
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#478638}
Reviewed-on: https://chromium-review.googlesource.com/549299
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/branch-heads/3112@{#476}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
[modify] https://crrev.com/260c644d232118eea29ef51197fb668545da72b4/content/browser/download/download_request_core.cc

Verified the fix on Mac 10.12.5, Win-10 and Ubuntu 14.04 using Chrome beta version #60.0.3112.50 as per the comment #0.
Attaching screen cast for reference.
Observed that some.txt file downloaded.
Hence, the fix is working as expected. 
Adding the verified labels.

Thanks...!!

 Issue 735080  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9cb51a30376e75d2de0d20db35dc346d0fcf92f4

commit 9cb51a30376e75d2de0d20db35dc346d0fcf92f4
Author: Jochen Eisinger <jochen@chromium.org>
Date: Thu Jun 29 20:05:44 2017

Test that suggested filenames for data: URLs work

BUG= 730050 ,  736304 
R=dtrainor@chromium.org

Change-Id: I2d0e02adee090787858aea446eafaf9efa22256d
Reviewed-on: https://chromium-review.googlesource.com/549896
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#483459}
[modify] https://crrev.com/9cb51a30376e75d2de0d20db35dc346d0fcf92f4/content/browser/download/download_browsertest.cc