More cleanup, based around searches for "Google.ProtocolBuffers"

- Remove some old proto2-based C#-only messages
- Remove the "build" directory which only contained out-of-date files
- Remove the csharp_namespace option from proto2 messages
- Change "Google.ProtocolBuffers" to "Google.Protobuf" in other messages

1 files changed, 1 insertions, 1 deletions

diff --git a/src/google/protobuf/unittest_preserve_unknown_enum.proto b/src/google/protobuf/unittest_preserve_unknown_enum.proto
index abc3de28..2f91332c 100644
--- a/src/google/protobuf/unittest_preserve_unknown_enum.proto
+++ b/src/google/protobuf/unittest_preserve_unknown_enum.proto
@@ -33,7 +33,7 @@ syntax = "proto3";
 package proto3_preserve_unknown_enum_unittest;
 option objc_class_prefix = "UnknownEnums";
 
-option csharp_namespace = "Google.ProtocolBuffers.TestProtos";
+option csharp_namespace = "Google.Protobuf.TestProtos";
 
 enum MyEnum {
   FOO = 0;