Remove WasmHeaderMapType::GrpcCreateInitialMetadata. (proxy-wasm#5)

Signed-off-by: John Plevyak <jplevyak@gmail.com>

Author: jplevyak

proxy_wasm_common.h

@@ -76,16 +76,15 @@ inline std::string toString(WasmResult r) {
 #undef _CASE
 
 enum class WasmHeaderMapType : int32_t {
- RequestHeaders = 0, // During the onLog callback these are immutable
- RequestTrailers = 1, // During the onLog callback these are immutable
- ResponseHeaders = 2, // During the onLog callback these are immutable
- ResponseTrailers = 3, // During the onLog callback these are immutable
- GrpcCreateInitialMetadata = 4,
- GrpcReceiveInitialMetadata = 5, // Immutable
- GrpcReceiveTrailingMetadata = 6, // Immutable
- HttpCallResponseHeaders = 7, // Immutable
- HttpCallResponseTrailers = 8, // Immutable
- MAX = 8,
+ RequestHeaders = 0, // During the onLog callback these are immutable
+ RequestTrailers = 1, // During the onLog callback these are immutable
+ ResponseHeaders = 2, // During the onLog callback these are immutable
+ ResponseTrailers = 3, // During the onLog callback these are immutable
+ GrpcReceiveInitialMetadata = 4, // Immutable
+ GrpcReceiveTrailingMetadata = 5, // Immutable
+ HttpCallResponseHeaders = 6, // Immutable
+ HttpCallResponseTrailers = 7, // Immutable
+ MAX = 7,
 };
 enum class WasmBufferType : int32_t {
  HttpRequestBody = 0, // During the onLog callback these are immutable