This change improves our compliance with the HTML specification for PDF Viewer handling (see https://html.spec.whatwg.org/multipage/system-state.html#pdf-viewing-support). html/webappapis/system-state-and-capabilities/the-navigator-object
<rdar://problem/100142265>
Pull request: https://github.com/WebKit/WebKit/pull/4506
Pull request: https://github.com/Webkit/WebKit/pull/4506
*** Bug 220495 has been marked as a duplicate of this bug. ***
Committed 255052@main (e6adcfb74700): <https://commits.webkit.org/255052@main> Reviewed commits have been landed. Closing PR #4506 and removing active labels.