Adding Release blocker for this issue. Please undo if not the case.

Thank You!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a3b6ea0d1f0ab0a3f757918366a7242b82fe2349

commit a3b6ea0d1f0ab0a3f757918366a7242b82fe2349
Author: Tommy Steimel <steimel@chromium.org>
Date: Sat Nov 11 01:44:44 2017

Disable "Mute site" option on chrome:// URLs

With the new site muting feature, "Mute tab" in the tab dropdown was
replaced with "Mute site", which mutes via a content setting. There are
no content settings for chrome:// urls, so this CL disables the "Mute
Site" option for those pages.

Bug:  782134 
Change-Id: Ib95027b3124ae75e49ab6f32556e73d4f2918d04
Reviewed-on: https://chromium-review.googlesource.com/758139
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515784}
[modify] https://crrev.com/a3b6ea0d1f0ab0a3f757918366a7242b82fe2349/chrome/browser/extensions/api/tabs/tabs_api.cc
[modify] https://crrev.com/a3b6ea0d1f0ab0a3f757918366a7242b82fe2349/chrome/browser/ui/tabs/tab_strip_model_impl.cc
[modify] https://crrev.com/a3b6ea0d1f0ab0a3f757918366a7242b82fe2349/chrome/browser/ui/tabs/tab_utils.cc
[modify] https://crrev.com/a3b6ea0d1f0ab0a3f757918366a7242b82fe2349/chrome/browser/ui/tabs/tab_utils.h

Fixed this, but the expected case has changed. Instead of muting the tab, it should instead not allow the user to click the option at all.

1. Launch Chrome.
2. Navigate to NTP ,right click on tab and see that "Mute site" option is disabled.

Thanks!

Update : 
Retested above issue on Windows(7,8,10) OS and Linux OS using latest Canary #64.0.3267.0 and issue is fixed. Kindly review an attached screen cast.

Thank you!

Deleted: FixedVideo.mp4 396 KB

	FixedVideo.mp4 396 KB View Download

Looks good, thanks!

Note:

Will soon update Mac info after testing it once Mac build is available. Thanks.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ac06f06510f555acd580cac6cf787ef8649efb71

commit ac06f06510f555acd580cac6cf787ef8649efb71
Author: Tommy Steimel <steimel@chromium.org>
Date: Wed Nov 22 22:33:23 2017

Revert "Disable "Mute site" option on chrome:// URLs"

This reverts commit a3b6ea0d1f0ab0a3f757918366a7242b82fe2349.

Reason for revert:

We landed this with the intention of not allowing muting for any chrome:// URLs, but we've now changed our minds due to  crbug.com/787743  (unable to mute chrome://dino tab).

Original change's description:
> Disable "Mute site" option on chrome:// URLs
> 
> With the new site muting feature, "Mute tab" in the tab dropdown was
> replaced with "Mute site", which mutes via a content setting. There are
> no content settings for chrome:// urls, so this CL disables the "Mute
> Site" option for those pages.
> 
> Bug:  782134 
> Change-Id: Ib95027b3124ae75e49ab6f32556e73d4f2918d04
> Reviewed-on: https://chromium-review.googlesource.com/758139
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Yuri Wiitala <miu@chromium.org>
> Commit-Queue: Tommy Steimel <steimel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#515784}

TBR=sky@chromium.org,miu@chromium.org,steimel@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug:  782134 
Change-Id: Iaddfa0f57dddda199906e43655839ca7f6bfc1ac
Reviewed-on: https://chromium-review.googlesource.com/786113
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518774}
[modify] https://crrev.com/ac06f06510f555acd580cac6cf787ef8649efb71/chrome/browser/extensions/api/tabs/tabs_api.cc
[modify] https://crrev.com/ac06f06510f555acd580cac6cf787ef8649efb71/chrome/browser/ui/tabs/tab_strip_model_impl.cc
[modify] https://crrev.com/ac06f06510f555acd580cac6cf787ef8649efb71/chrome/browser/ui/tabs/tab_utils.cc
[modify] https://crrev.com/ac06f06510f555acd580cac6cf787ef8649efb71/chrome/browser/ui/tabs/tab_utils.h

Rechecked again and above issue is still reproducible on Windows (7,8,10),Linux (14.04 LTS),Mac(10.12.6, 10.13.2) on latest canary version i.e. 64.0.3276.0 (Official Build)

Please refer attached screencast

Deleted: Actual_Ntp.mp4 303 KB

	Actual_Ntp.mp4 303 KB View Download

Rechecked again and above issue is still reproducible on Windows (7,8,10),Linux (14.04 LTS),Mac(10.12.6, 10.13.2) on latest canary version i.e. 64.0.3279.0 (Official Build)
Please refer attached screencast

Deleted: FixedVideo.mp4 487 KB

	FixedVideo.mp4 487 KB View Download

Un-resolving this since the fix was reverted. There's a CL in review that we re-fix this, though the expected case is going to change back to:

1. Launch Chrome.
2. Navigate to NTP, right click on tab and click "Mute site" option and observe.

Expected Result: Tab should get muted after clicking on "Mute site", mute icon should be visible on tab.

Thanks!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/37112950bc5ed3dbd06fdf42c0367ff246939287

commit 37112950bc5ed3dbd06fdf42c0367ff246939287
Author: Tommy Steimel <steimel@chromium.org>
Date: Wed Nov 29 19:41:45 2017

Add ability to mute chrome:// pages

Bug:  787743 ,  785711 ,  782134 
Change-Id: I77fe9a7192697ebe82734231ae709c2094b57b62
Reviewed-on: https://chromium-review.googlesource.com/791813
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520203}
[modify] https://crrev.com/37112950bc5ed3dbd06fdf42c0367ff246939287/chrome/browser/content_settings/sound_content_setting_observer.cc
[modify] https://crrev.com/37112950bc5ed3dbd06fdf42c0367ff246939287/chrome/browser/content_settings/sound_content_setting_observer_unittest.cc
[modify] https://crrev.com/37112950bc5ed3dbd06fdf42c0367ff246939287/chrome/browser/extensions/extension_tab_util.cc
[modify] https://crrev.com/37112950bc5ed3dbd06fdf42c0367ff246939287/chrome/browser/ui/tabs/tab_utils.cc
[modify] https://crrev.com/37112950bc5ed3dbd06fdf42c0367ff246939287/chrome/browser/ui/tabs/tab_utils.h