Using the per-revision bisect providing the bisect results,
Good build: 57.0.2946.0 (Revision: 437422).
Bad build: 57.0.2947.0 (Revision: 437705).

You are probably looking for a change made after 437652 (known good), but no later than 437653 (first known bad).
CHANGELOG URL:
  https://chromium.googlesource.com/chromium/src/+log/2ad505df6c7974c38b2130c71169e60b679bbae2..cee4c12b4204f5ab1211903d0b5fd0da8b8b5c90

@tommycli -- Could you please look into the issue, pardon me if it has nothing to do with your changes and if possible please assign it to concern owner.
Adding RB Label as this is a recent Regression. Please remove if that is not the case.

Thank You.

This is a must-fix for M56.

I'm guessing the Mac Cocoa version has special code that makes it interact with the ContentSettingBubbleModel changes in a bad way.

Able to reproduce the issue on mac 10.12.2 chrome canary # 57.0.2953.0

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9a463996fbbbde1dbee191d29b28cfa16a4eb0fb

commit 9a463996fbbbde1dbee191d29b28cfa16a4eb0fb
Author: tommycli <tommycli@chromium.org>
Date: Wed Dec 21 17:33:16 2016

[HBD] Update Cocoa to match removed controls from Plugins Blocked popup.

This CL leaves the xib files alone, but manually removes the unneeded
controls in the .mm file to match the Views version.

The Views code was changed in this CL:
https://codereview.chromium.org/2552343005

BUG= 674062 

Review-Url: https://codereview.chromium.org/2593743002
Cr-Commit-Position: refs/heads/master@{#440139}

[modify] https://crrev.com/9a463996fbbbde1dbee191d29b28cfa16a4eb0fb/chrome/browser/ui/cocoa/content_settings/content_setting_bubble_cocoa.mm

Your change meets the bar and is auto-approved for M56 (branch: 2924)

yfulgaonkar or msrchandra:

Can you verify that this has been fixed on Mac Canary? The fix should be in versions 57.0.2959.0 and later.

Tommy

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

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

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

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

Thanks for the fix, working as intended in latest canary- 57.0.2970.1.

FYI: Beta RC cut is scheduled at 3.00 PM today 01/03, please merged the CL ASAP.

Correction : Verified in chrome version-57.0.2970.0

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a414b8cea0fcbdb96030ad433a2cf6b7af9e8de8

commit a414b8cea0fcbdb96030ad433a2cf6b7af9e8de8
Author: Tommy C. Li <tommycli@chromium.org>
Date: Tue Jan 10 02:01:17 2017

[HBD] Update Cocoa to match removed controls from Plugins Blocked popup.

This CL leaves the xib files alone, but manually removes the unneeded
controls in the .mm file to match the Views version.

The Views code was changed in this CL:
https://codereview.chromium.org/2552343005

BUG= 674062 

Review-Url: https://codereview.chromium.org/2593743002
Cr-Commit-Position: refs/heads/master@{#440139}
(cherry picked from commit 9a463996fbbbde1dbee191d29b28cfa16a4eb0fb)

Review-Url: https://codereview.chromium.org/2623563003 .
Cr-Commit-Position: refs/branch-heads/2924@{#710}
Cr-Branched-From: 3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}

[modify] https://crrev.com/a414b8cea0fcbdb96030ad433a2cf6b7af9e8de8/chrome/browser/ui/cocoa/content_settings/content_setting_bubble_cocoa.mm

verified this issue on Mac 10.12.2 with chrome version #56.0.2924.59 

These are the steps i followed 
1. Navigated to www.vudu.com
2. Clicked on the view site info and block the flash plugin and reloaded the web page.
3. clicked on the watch trailer for any movie 
4. Got the notification in the omnibox with flash plugin.

Observed that it didn't display any radio buttons with options allow or continue the blocking plugins and the button which says "Run all plugins this time"

Attaching the screenshot and screencast for reference, Could you please look into it and let us know this is the expected behavior for this fix?

Deleted: Issue 674062.png 20.9 KB

	Issue 674062.png 20.9 KB View Download

Deleted: Issue 674062.mp4 1.6 MB

	Issue 674062.mp4 1.6 MB View Download