UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.51 Safari/537.36

Steps to reproduce the problem:
1. Open a tab with https://helpx.adobe.com/flash-player.html
2. Manually block Flash plugin for this domain
3. Enable Flash for helpx.adobe.com from a chrome extension, example:

chrome.contentSettings["plugins"].set({
        'primaryPattern': "*://helpx.adobe.com/*",
        'setting': "allow",
        'scope': ('regular')
    }, function(){});

4. Reload the page and see that the Flash animation still doesn't work and Flash isn't detected by the page
(although you can see Flash is enabled by an extension in the little 'i' sign in the address bar)
5. On the same tab, navigate to www.google.com and go back - the animation works , Flash is detected by the page
6. Opening a new tab with the same url would also work

What is the expected behavior?
Flash plugin should be enabled on the same tab after reloading the page (same as when changing the settings manually and not from Extension API)

What went wrong?
Although the page was refreshed, Flash plugin remained blocked until navigating away to another domain or opening a new tab

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 56.0.2924.51  Channel: beta
OS Version: OS X 10.11.6
Flash Version: 24.0.0.194

There is a similar, however *different*, bug - for incognito scenario - https://bugs.chromium.org/p/chromium/issues/detail?id=494501#
 

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