Fix build issue

Author: nicolasgarnier

codelab-elements/google-codelab/BUILD.bazel

@@ -25,7 +25,7 @@ closure_js_library(
     name = "google_codelab",
     srcs = [
         "google_codelab.js",
-        "google_codelab_def.js"
+        "google_codelab_def.js",
     ],
     deps = [
         "@io_bazel_rules_closure//closure/library",
@@ -40,6 +40,9 @@ closure_js_library(
     srcs = [
         "externs.js",
     ],
+    suppress = [
+        "JSC_STRICT_INEXISTENT_PROPERTY",
+    ]
 )
 
 # Compiled version of GoogleCodelabStep element, suitable for distribution.