Update //third_party/protobuf to version 3.

third_party/protobuf/objectivec/Tests/unittest_cycle.proto

Index: third_party/protobuf/objectivec/Tests/unittest_cycle.proto
diff --git a/third_party/protobuf/src/google/protobuf/unittest_optimize_for.proto b/third_party/protobuf/objectivec/Tests/unittest_cycle.proto
similarity index 67%
copy from third_party/protobuf/src/google/protobuf/unittest_optimize_for.proto
copy to third_party/protobuf/objectivec/Tests/unittest_cycle.proto
index feecbef8d4a90961b35be988402e49e74fed313c..5f6f56a1aee1d91b3db2cc2b5cc45192734596bc 100644
--- a/third_party/protobuf/src/google/protobuf/unittest_optimize_for.proto
+++ b/third_party/protobuf/objectivec/Tests/unittest_cycle.proto
@@ -1,6 +1,5 @@
 // Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// Copyright 2015 Google Inc.  All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -28,34 +27,32 @@
 // (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)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-//
-// A proto file which uses optimize_for = CODE_SIZE.
-
-import "google/protobuf/unittest.proto";
+syntax = "proto2";
 
 package protobuf_unittest;
 
-option optimize_for = CODE_SIZE;
+// Cycles in the Message graph can cause problems for the mutable classes
+// since the properties on the mutable class change types. This file just
+// needs to generate source, and that source must compile, to ensure the
+// generated source works for this sort of case.
 
-message TestOptimizedForSize {
-  optional int32 i = 1;
-  optional ForeignMessage msg = 19;
+// You can't make a object graph that spans files, so this can only be done
+// within a single proto file.
 
-  extensions 1000 to max;
-
-  extend TestOptimizedForSize {
-    optional int32 test_extension = 1234;
-    optional TestRequiredOptimizedForSize test_extension2 = 1235;
-  }
+message CycleFoo {
+  optional CycleFoo a_foo = 1;
+  optional CycleBar a_bar = 2;
+  optional CycleBaz a_baz = 3;
 }
 
-message TestRequiredOptimizedForSize {
-  required int32 x = 1;
+message CycleBar {
+  optional CycleBar a_bar = 1;
+  optional CycleBaz a_baz = 2;
+  optional CycleFoo a_foo = 3;
 }
- 
-message TestOptionalOptimizedForSize {
-  optional TestRequiredOptimizedForSize o = 1;
+
+message CycleBaz {
+  optional CycleBaz a_baz = 1;
+  optional CycleFoo a_foo = 2;
+  optional CycleBar a_bar = 3;
 }