fix url-classifier checks against bare-domain entries. b=402435, r=tony

toolkit/components/url-classifier/src/nsUrlClassifierDBService.cpp

@@ -702,7 +702,10 @@ nsUrlClassifierDBServiceWorker::GetLookupFragments(const nsACString& spec,
     paths.AppendCString(path);
   }
 
-  numComponents = 0;
+  // Check an empty path (for whole-domain blacklist entries)
+  paths.AppendCString(EmptyCString());
+
+  numComponents = 1;
   path.BeginReading(begin);
   path.EndReading(end);
   iter = begin;

toolkit/components/url-classifier/tests/unit/test_dbservice.js

@@ -44,6 +44,11 @@ for (var i = 0; i < chunk1Urls.length; i++) {
   phishUnexpected[chunk1Urls[i]] = true;
 }
 
+// Check that the entries hit based on sub-parts
+phishExpected["baz.com/foo/bar"] = true;
+phishExpected["foo.bar.baz.com/foo"] = true;
+phishExpected["bar.baz.com/"] = true;
+
 var numExpecting;
 
 function testFailure(arg) {