Update com_github_gflags_gflags from v2.2.1 to v2.2.2.

PiperOrigin-RevId: 444703893
diff --git a/tensorflow/workspace2.bzl b/tensorflow/workspace2.bzl
index 40d61b9..ed7571f 100644
--- a/tensorflow/workspace2.bzl
+++ b/tensorflow/workspace2.bzl
@@ -474,9 +474,9 @@
 
     tf_http_archive(
         name = "com_github_gflags_gflags",
-        sha256 = "ae27cdbcd6a2f935baa78e4f21f675649271634c092b1be01469440495609d0e",
-        strip_prefix = "gflags-2.2.1",
-        urls = tf_mirror_urls("https://github.com/gflags/gflags/archive/v2.2.1.tar.gz"),
+        sha256 = "34af2f15cf7367513b352bdcd2493ab14ce43692d2dcd9dfc499492966c64dcf",
+        strip_prefix = "gflags-2.2.2",
+        urls = tf_mirror_urls("https://github.com/gflags/gflags/archive/v2.2.2.tar.gz"),
     )
 
     tf_http_archive(