REGRESSION(266247@main): PDF "Save" button does nothing, "Print" func…

…tion also broken

https://bugs.webkit.org/show_bug.cgi?id=260771

Reviewed by Chris Dumez.

The PDF.js viewer protocol and resource protocols both should be treated
the same as HTTP protocols and have access to blob URLs. The protocol is
an implementation detail that shouldn't affect how the web content
behaves and certainly should not restrict access to web platform
features.

* Source/WebCore/page/SecurityOrigin.cpp:
(WebCore::isSafelistedBlobProtocol):

Canonical link: https://commits.webkit.org/270274@main

Source/WebCore/page/SecurityOrigin.cpp

@@ -178,6 +178,12 @@ inline bool isSafelistedBlobProtocol(const URL& url)
     // except that assert gets hit on certain tests.
     return url.protocolIsInHTTPFamily()
         || url.protocolIsFile()
+#if PLATFORM(GTK) || PLATFORM(WPE)
+        || url.protocolIs("resource"_s)
+#endif
+#if ENABLE(PDFJS)
+        || url.protocolIs("webkit-pdfjs-viewer"_s)
+#endif
         || LegacySchemeRegistry::schemeIsHandledBySchemeHandler(url.protocol());
 }