Remove unused protobuf dependency.

BUILD

@@ -32,7 +32,6 @@ cc_library(
     deps = [
         ":include",
         "@boringssl//:crypto",
-        "@com_google_protobuf//:protobuf_lite",
         "@proxy_wasm_cpp_sdk//:api_lib",
     ],
 )

bazel/external/proxy-wasm-cpp-sdk.BUILD

@@ -15,7 +15,4 @@ cc_library(
         "proxy_wasm_common.h",
         "proxy_wasm_enums.h",
     ],
-    deps = [
-        "@com_google_protobuf//:protobuf_lite",
-    ],
 )

bazel/repositories.bzl

@@ -67,13 +67,6 @@ def proxy_wasm_cpp_host_repositories():
         url = "https://github.com/bazelbuild/rules_rust/archive/96d5118f03411f80182fd45426e259eedf809d7a.tar.gz",
     )
 
-    http_archive(
-        name = "com_google_protobuf",
-        sha256 = "59621f4011a95df270748dcc0ec1cc51946473f0e140d4848a2f20c8719e43aa",
-        strip_prefix = "protobuf-655310ca192a6e3a050e0ca0b7084a2968072260",
-        url = "https://github.com/protocolbuffers/protobuf/archive/655310ca192a6e3a050e0ca0b7084a2968072260.tar.gz",
-    )
-
     http_archive(
         name = "rules_foreign_cc",
         sha256 = "d54742ffbdc6924f222d2179f0e10e911c5c659c4ae74158e9fe827aad862ac6",

include/proxy-wasm/null_plugin.h

@@ -17,7 +17,6 @@
 
 #include <memory>
 
-#include "google/protobuf/message.h"
 #include "include/proxy-wasm/null_vm_plugin.h"
 #include "include/proxy-wasm/wasm.h"
 #include "include/proxy-wasm/exports.h"

include/proxy-wasm/wasm_api_impl.h

@@ -15,6 +15,17 @@
 
 #pragma once
 
+// Required by "proxy_wasm_api.h" included within null_plugin namespace.
+
+#include <cstring>
+#include <functional>
+#include <memory>
+#include <string>
+#include <tuple>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
 namespace proxy_wasm {
 namespace null_plugin {