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- Remove the "build" directory which only contained out-of-date files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, 0 insertions, 1 deletions

diff --git a/src/google/protobuf/unittest_import_public.proto b/src/google/protobuf/unittest_import_public.proto
index 0bc5d617..ffaf7736 100644
--- a/src/google/protobuf/unittest_import_public.proto
+++ b/src/google/protobuf/unittest_import_public.proto
@@ -35,7 +35,6 @@ syntax = "proto2";
 package protobuf_unittest_import;
 
 option java_package = "com.google.protobuf.test";
-option csharp_namespace = "Google.ProtocolBuffers.TestProtos";
 
 message PublicImportMessage {
   optional int32 e = 1;