Update //third_party/protobuf to version 3.

third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_import_nano.proto

Index: third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_import_nano.proto
diff --git a/third_party/protobuf/src/google/protobuf/unittest_import_lite.proto b/third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_import_nano.proto
similarity index 81%
copy from third_party/protobuf/src/google/protobuf/unittest_import_lite.proto
copy to third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_import_nano.proto
index 81b117fe8489ecc4cba5410dbf876b4ca473657b..1a3ddc57ea89854cd466655fa551c7b67b68a4c7 100644
--- a/third_party/protobuf/src/google/protobuf/unittest_import_lite.proto
+++ b/third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_import_nano.proto
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -30,22 +30,19 @@
 
 // Author: kenton@google.com (Kenton Varda)
 //
-// This is like unittest_import.proto but with optimize_for = LITE_RUNTIME.
+// This is like unittest_import.proto but with optimize_for = NANO_RUNTIME.
 
 package protobuf_unittest_import;
 
-option optimize_for = LITE_RUNTIME;
+option java_package = "com.google.protobuf.nano.testimport";
+option java_outer_classname = "UnittestImportNano";
 
-option java_package = "com.google.protobuf";
-
-import public "google/protobuf/unittest_import_public_lite.proto";
-
-message ImportMessageLite {
+message ImportMessageNano {
   optional int32 d = 1;
 }
 
-enum ImportEnumLite {
-  IMPORT_LITE_FOO = 7;
-  IMPORT_LITE_BAR = 8;
-  IMPORT_LITE_BAZ = 9;
+enum ImportEnumNano {
+  IMPORT_NANO_FOO = 7;
+  IMPORT_NANO_BAR = 8;
+  IMPORT_NANO_BAZ = 9;
 }