Update //third_party/protobuf to version 3.

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

Index: third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_repeated_merge_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_repeated_merge_nano.proto
similarity index 78%
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_repeated_merge_nano.proto
index 81b117fe8489ecc4cba5410dbf876b4ca473657b..ef4e2d2f65ffbd6a0104441997f73ee924f33f20 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_repeated_merge_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
@@ -28,24 +28,20 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: kenton@google.com (Kenton Varda)
-//
-// This is like unittest_import.proto but with optimize_for = LITE_RUNTIME.
+// Author: maxtroy@google.com (Max Cai)
 
-package protobuf_unittest_import;
+package protobuf_unittest;
 
-option optimize_for = LITE_RUNTIME;
+import "google/protobuf/nano/unittest_nano.proto";
 
 option java_package = "com.google.protobuf";
+option java_multiple_files = true;
 
-import public "google/protobuf/unittest_import_public_lite.proto";
+// A container message for testing the merging of repeated fields at a
+// nested level. Other tests will be done using the repeated fields in
+// TestAllTypesNano.
+message TestRepeatedMergeNano {
 
-message ImportMessageLite {
-  optional int32 d = 1;
-}
+  optional TestAllTypesNano contained = 1;
 
-enum ImportEnumLite {
-  IMPORT_LITE_FOO = 7;
-  IMPORT_LITE_BAR = 8;
-  IMPORT_LITE_BAZ = 9;
 }