Upgrade gerrit_api and gerrit_polymer to 3.9.1

3.9.1 uses a new version of rules_nodejs.

Change-Id: I94ce82f545fc32c8dfcd44f6db334b1f46dc5166
diff --git a/gerrit_api.bzl b/gerrit_api.bzl
index 9191c37..9802f8c 100644
--- a/gerrit_api.bzl
+++ b/gerrit_api.bzl
@@ -7,9 +7,9 @@
 gerrit_api is rule for fetching Gerrit plugin API using Bazel.
 """
 
-def gerrit_api(version = "3.8.0",
-               plugin_api_sha1 = "a62bffd9170d4550ada2f7b75e0bfa6de0ced441",
-               acceptance_framework_sha1 = "20f1f514e6a9d52c2132a2e220928629a38abab1"):
+def gerrit_api(version = "3.9.1",
+               plugin_api_sha1 = "d6bbdd4ac1935415dd3907478bdfce821e111907",
+               acceptance_framework_sha1 = "1fc74722ae0741cfe238cac0aa4d4ead5dec9b03"):
     gerrit_api_version(
         name = "gerrit_api_version",
         version = version,
diff --git a/gerrit_polymer.bzl b/gerrit_polymer.bzl
index 883f519..f2bb143 100644
--- a/gerrit_polymer.bzl
+++ b/gerrit_polymer.bzl
@@ -3,6 +3,6 @@
 def gerrit_polymer():
     http_archive(
         name = "build_bazel_rules_nodejs",
-        sha256 = "c29944ba9b0b430aadcaf3bf2570fece6fc5ebfb76df145c6cdad40d65c20811",
-        urls = ["https://github.com/bazelbuild/rules_nodejs/releases/download/5.7.0/rules_nodejs-5.7.0.tar.gz"],
+        sha256 = "94070eff79305be05b7699207fbac5d2608054dd53e6109f7d00d923919ff45a",
+        urls = ["https://github.com/bazelbuild/rules_nodejs/releases/download/5.8.2/rules_nodejs-5.8.2.tar.gz"],
     )