third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/patches/0008-uninline_get_empty_string.patch

Index: third_party/protobuf/patches/0008-uninline_get_empty_string.patch
diff --git a/third_party/protobuf/patches/0008-uninline_get_empty_string.patch b/third_party/protobuf/patches/0008-uninline_get_empty_string.patch
index 8faf5186251bd8767b42825041f9e1f7a5d35896..727d6f3c0f3aa357847855539a2cc20eb2a96b39 100644
--- a/third_party/protobuf/patches/0008-uninline_get_empty_string.patch
+++ b/third_party/protobuf/patches/0008-uninline_get_empty_string.patch
@@ -18,10 +18,10 @@ only in patch2:
 unchanged:
 --- protobuf-cleaned/src/google/protobuf/generated_message_util.h	2015-12-30 13:21:46.000000000 -0800
 +++ protobuf-patched/src/google/protobuf/generated_message_util.h	2016-03-31 13:25:40.252007316 -0700
-@@ -84,10 +84,8 @@
-   assert(empty_string_ != NULL);
-   return *empty_string_;
+@@ -120,10 +120,8 @@
+   return fixed_address_empty_string.get();
  }
+ 
 -LIBPROTOBUF_EXPORT inline const ::std::string& GetEmptyString() {
 -  ::google::protobuf::GoogleOnceInit(&empty_string_once_init_, &InitEmptyString);
 -  return GetEmptyStringAlreadyInited();