Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment_unittest.cc

Index: third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment_unittest.cc
diff --git a/third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment_unittest.cc b/third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment_unittest.cc
index 28b6d8b49e4996cf7d9df2569a5240a27b07996b..ae582ea6490401f2c4d8a20d0c142464a0164241 100644
--- a/third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment_unittest.cc
+++ b/third_party/protobuf/src/google/protobuf/compiler/java/java_doc_comment_unittest.cc
@@ -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
@@ -46,6 +46,7 @@ TEST(JavaDocCommentTest, Escaping) {
   EXPECT_EQ("{@foo}", EscapeJavadoc("{@foo}"));
   EXPECT_EQ("&lt;i&gt;&amp;&lt;/i&gt;", EscapeJavadoc("<i>&</i>"));
   EXPECT_EQ("foo&#92;u1234bar", EscapeJavadoc("foo\\u1234bar"));
+  EXPECT_EQ("&#64;deprecated", EscapeJavadoc("@deprecated"));
 }
 
 // TODO(kenton):  It's hard to write a robust test of the doc comments -- we