Update protobuf to commit 2b7430d

Change: 149495758

Author: Manjunath Kudlur

tensorflow/workspace.bzl

@@ -221,11 +221,11 @@ def tf_workspace(path_prefix = "", tf_repo_name = ""):
   native.http_archive(
       name = "protobuf",
       urls = [
-          "http://bazel-mirror.storage.googleapis.com/github.com/google/protobuf/archive/ef927cc428db7bf41d3a593a16a8f1a0fe6306c5.tar.gz",
-          "https://github.com/google/protobuf/archive/ef927cc428db7bf41d3a593a16a8f1a0fe6306c5.tar.gz",
+          "http://bazel-mirror.storage.googleapis.com/github.com/google/protobuf/archive/2b7430d96aeff2bb624c8d52182ff5e4b9f7f18a.tar.gz",
+          "https://github.com/google/protobuf/archive/2b7430d96aeff2bb624c8d52182ff5e4b9f7f18a.tar.gz",
       ],
-      sha256 = "8813a4ab27f7c61565d0db17d69236b4ec0b1404371efc728f15079b85e457ca",
-      strip_prefix = "protobuf-ef927cc428db7bf41d3a593a16a8f1a0fe6306c5",
+      sha256 = "e5d3d4e227a0f7afb8745df049bbd4d55474b158ca5aaa2a0e31099af24be1d0",
+      strip_prefix = "protobuf-2b7430d96aeff2bb624c8d52182ff5e4b9f7f18a",
   )
 
   native.new_http_archive(