Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/src/google/protobuf/unittest_proto3_arena_lite.proto

 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
 // 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
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
@@ skipping 13 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 syntax = "proto3";
 
 option cc_enable_arenas = true;
+option optimize_for = LITE_RUNTIME;
 
 import "google/protobuf/unittest_import.proto";
 
-package proto3_arena_unittest;
+package proto3_arena_lite_unittest;
 
 // This proto includes every type of field in both singular and repeated
 // forms.
 message TestAllTypes {
   message NestedMessage {
     // The field name "b" fails to compile in proto1 because it conflicts with
     // a local variable named "b" in one of the generated methods.  Doh.
     // This file needs to compile in proto1 to test backwards-compatibility.
     int32 bb = 1;
   }
@@ skipping 149 matching lines @@
   FOREIGN_ZERO = 0;
   FOREIGN_FOO = 4;
   FOREIGN_BAR = 5;
   FOREIGN_BAZ = 6;
 }
 
 // TestEmptyMessage is used to test behavior of unknown fields.
 message TestEmptyMessage {
 }