Below is manual regression range.

Good build: 61.0.3155.0
Bad build: 61.0.3156.0

Note: Issue is also reproducible on Mac (10.11.6, 10.12.3) & Linux (14.04 LTS) OS.

URL: chrome-search://most-visited/single.html?removeTooltip=Don%27t%20show%20on%20this%20page

Mac & Linux behavior: After recording the audit to NTP, it's navigated to above URL and page gets blank.

Kindly review the attached screen-cast for reference.

Deleted: Actual behavior.mp4 1.4 MB

	Actual behavior.mp4 1.4 MB View Download

Deleted: Expected behavior.mp4 1.1 MB

	Expected behavior.mp4 1.1 MB View Download

Narrow bisect:
https://chromium.googlesource.com/chromium/src/+log/7577c2eff30d9627418258e3083524f2c7d878db..8bc8e844008bd1d33ed524fdef69f1c300e4b6b0?pretty=fuller&n=100

Suspecting: r486136 ?

@phulce: Kindly help to reassign, if your changes are not related to this issue.

Adding Release Block-Stable for this issue.Please remove if not the case.

Thank You!

r486136 was a fix for an issue that was probably masking the underlying bug from previous revision (since an audit couldn't be run at all in 61.0.3155.0)

@pfeldman could this be related to emulation/viewport changes made recently?

There seem to be multiple issues at play here, the emulation size not returning to normal as observed in the "Actual" video above, and the wrong URL is being audited when there are multiple targets on the page. I'm investigating the latter, reassigned for the described issue of NTP appearance issues.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/12ed41235b2ec901fc7a3512e2aa5fcacf7a6229

commit 12ed41235b2ec901fc7a3512e2aa5fcacf7a6229
Author: Patrick Hulce <phulce@chromium.org>
Date: Fri Jul 14 21:09:27 2017

DevTools: return the correct defaultExecutionContext

* Uses the sorted list by frame to determine the defaultExecutionContext.
* Fixes issue where Audits panel would audit the wrong URL.

BUG= 742044 

Change-Id: I56a1ebd0a0d1f2f9decd603f78c5b73921ea635e
Reviewed-on: https://chromium-review.googlesource.com/570921
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Patrick Hulce <phulce@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486888}
[modify] https://crrev.com/12ed41235b2ec901fc7a3512e2aa5fcacf7a6229/third_party/WebKit/Source/devtools/front_end/audits2/Audits2Panel.js
[modify] https://crrev.com/12ed41235b2ec901fc7a3512e2aa5fcacf7a6229/third_party/WebKit/Source/devtools/front_end/sdk/RuntimeModel.js

Retested this issue on Windows, Mac and Linux machine using Dev build #61.0.3159.5 (Official Build). It's still reproducible.

Attaching screen-cast for the same. 

Deleted: Dev 61.0.3159.5 behavior.mp4 951 KB

	Dev 61.0.3159.5 behavior.mp4 951 KB View Download

Rechecked this issue on Windows 10 and Mac 10.11.6 OS using chrome version 61.0.3163.13 and fix is working as expected i.e. NTP is seen properly after running the audit.

Attaching screen-cast for the same.

Deleted: 61.0.3163.13_behavior.mp4 1.1 MB

	61.0.3163.13_behavior.mp4 1.1 MB View Download

Retested this issue on Linux 14.04 OS using build #61.0.3163.13 and fix is working as intended.

URGENT - PTAL.
Your bug is labelled as Stable ReleaseBlock, pls make sure to land the fix and get it merged into the M61 branch #3163 ASAP to have enough baking time in Beta before Stable promotion. Thank you!

Know that this issue shouldn't block the release?  Remove the ReleaseBlock-Stable label.

Can this issue be marked as Fixed as issue is already verified on M61 Builds (Ref Comment#9, 10)

Thanks.!

[Bulk Edit]
URGENT - PTAL.
Your bug is labelled as M61 Stable ReleaseBlock, pls make sure to land the fix and get it merged into the release branch ASAP.

Know that this issue shouldn't block the release?  Remove the ReleaseBlock-Stable label.

Thank you.

marking the bug as "Fixed" since the CL has been merged to M61 and got verified by test team.

[Auto-generated comment by a script] We noticed that this issue is targeted for M-61; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-61 label, otherwise remove Merge-TBD label. Thanks.

There is no M61 merge is needed here.