Update //third_party/protobuf to version 3.

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

Index: third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_nano.proto
diff --git a/third_party/protobuf/src/google/protobuf/unittest_import_public_lite.proto b/third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_nano.proto
similarity index 81%
copy from third_party/protobuf/src/google/protobuf/unittest_import_public_lite.proto
copy to third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_nano.proto
index d077563cbd84d7be6daddec3f553cb564f23da0a..3a1e07f6d9d325993ffe5585c0d95ad844dc3b9e 100644
--- a/third_party/protobuf/src/google/protobuf/unittest_import_public_lite.proto
+++ b/third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_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
@@ -28,15 +28,21 @@
 // (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: liujisi@google.com (Pherl Liu)
+// Author: maxtroy@google.com (Max Cai)
 
-
-package protobuf_unittest_import;
-
-option optimize_for = LITE_RUNTIME;
+package protobuf_unittest;
 
 option java_package = "com.google.protobuf";
+option java_outer_classname = "EnumClassNanos";
+
+enum FileScopeEnum {
+  ONE = 1;
+}
 
-message PublicImportMessageLite {
-  optional int32 e = 1;
+message EnumClassNano {
+  enum MessageScopeEnum {
+    TWO = 2;
+  }
+  optional FileScopeEnum one = 1 [ default = ONE ];
+  optional MessageScopeEnum two = 2 [ default = TWO ];
 }