a === b -> identical(a, b)

utils/apidoc/apidoc.dart

Index: utils/apidoc/apidoc.dart
diff --git a/utils/apidoc/apidoc.dart b/utils/apidoc/apidoc.dart
index 785c497b46fe6438e93d9e7dd7a7b360af234185..065d84ac109cf2826fa755cb22d829b1c7f9c631 100644
--- a/utils/apidoc/apidoc.dart
+++ b/utils/apidoc/apidoc.dart
@@ -413,13 +413,13 @@ class Apidoc extends doc.Dartdoc {
                             doc.DocComment fileComment,
                             doc.DocComment handWrittenComment) {
     // Prefer the hand-written comment first.
-    if (handWrittenComment !== null) return handWrittenComment;
+    if (handWrittenComment != null) return handWrittenComment;
 
     // Otherwise, prefer comment from the (possibly generated) Dart file.
-    if (fileComment !== null) return fileComment;
+    if (fileComment != null) return fileComment;
 
     // Finally, fallback on MDN if available.
-    if (mdnComment !== null) {
+    if (mdnComment != null) {
       mdnUrl = mdnComment.mdnUrl;
       return mdnComment;
     }