UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2664.0 Safari/537.36

Steps to reproduce the problem:
Given the following stylesheet:

.referencetooltip li {
        border: #080086 2px solid;
        max-width: 260px;
        padding: 10px 8px 13px 8px;
        margin: 0px;
        background-color: #F7F7F7;
        -webkit-box-shadow: 2px 4px 2px rgba(0,0,0,0.3);
        -moz-box-shadow: 2px 4px 2px rgba(0,0,0,0.3);
        box-shadow: 2px 4px 2px rgba(0,0,0,0.3);
}
.client-js body .referencetooltip li li {
        border: none;
        -webkit-box-shadow: none;
        -moz-box-shadow: none;
        box-shadow: none;
}

The warning was emitted twice as part of the "Web Page Performance" audit in Chrome Dev Tools.

What is the expected behavior?

What went wrong?
The warning should only be emitted if the standard "box-shadow" wasn't specified. Or perhaps it could emit it if the standard rule was before the prefixed rule. But if the rule follows the standard practice of listing them in the right order, then the -webkit-box-shadow shouldn't apply, and neither should the warning.

Did this work before? N/A 

Chrome version: 51.0.2664.0  Channel: canary
OS Version: OS X 10.10.5
Flash Version: Shockwave Flash 21.0 r0
 

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