Bug 1593560 - Allow data urls with DocumentChannel. r=nika

Differential Revision: https://phabricator.services.mozilla.com/D51547

--HG--
extra : moz-landing-system : lando

docshell/base/nsDocShell.cpp

@@ -9547,8 +9547,8 @@ static bool IsConsideredSameOriginForUIR(nsIPrincipal* aTriggeringPrincipal,
 }
 
 static bool SchemeUsesDocChannel(nsIURI* aURI) {
-  return aURI && (aURI->SchemeIs("http") || aURI->SchemeIs("https") ||
-                  aURI->SchemeIs("moz"));
+  return SchemeIsHTTP(aURI) || SchemeIsHTTPS(aURI) || aURI->SchemeIs("moz") ||
+         SchemeIsData(aURI);
 }
 
 /* static */ bool nsDocShell::CreateChannelForLoadState(