Update third_party/protobuf from 3.2.0 to 3.4.0

Change-Id: I3648aadad5895f80051ada39d0ca862dd437cc58
PiperOrigin-RevId: 167266028

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index e5312c2..0183d49 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -74,14 +74,14 @@
 
 new_local_repository(
     name = "com_google_protobuf",
-    build_file = "./third_party/protobuf/3.2.0/BUILD",
-    path = "./third_party/protobuf/3.2.0/",
+    build_file = "./third_party/protobuf/3.4.0/BUILD",
+    path = "./third_party/protobuf/3.4.0/",
 )
 
 new_local_repository(
     name = "com_google_protobuf_java",
-    build_file = "./third_party/protobuf/3.2.0/com_google_protobuf_java.BUILD",
-    path = "./third_party/protobuf/3.2.0/",
+    build_file = "./third_party/protobuf/3.4.0/com_google_protobuf_java.BUILD",
+    path = "./third_party/protobuf/3.4.0/",
 )
 
 new_local_repository(