testv3.go was generated with an older version of codegen, to test reflection behavior with grpc.SupportPackageIsVersion3. DO NOT REGENERATE!
testv3.go was then manually edited to replace "golang.org/x/net/context" with "context".
dynamic.go was generated with a newer protoc and manually edited to remove everything except the descriptor bytes var, which is renamed and exported.
simple_message_v1.go was generated using protoc-gen-go v1.3.5 which doesn't support the MesssageV2 API. As a result the generated code implements only the old MessageV1 API.