> The majority of the functionality that we care about in our web browsers comes from an open source library. WebKit and Blink are not "an" open source library

> The majority of the functionality that we care about in our web browsers comes from an open source library. WebKit and Blink are not "an" open source library. They are two open source libraries (and, in the case of Blink, more of a tightly-coupled component of Chromium than a library).