pw_protobuf_compiler: Merge plugin_deps into python_deps

Change-Id: Ib53ba189b3ea683327fe4650427a18b7c7498a87
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/35962
Reviewed-by: Alexei Frolov <frolv@google.com>
Commit-Queue: Wyatt Hepler <hepler@google.com>
Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com>
diff --git a/pw_protobuf_compiler/proto.gni b/pw_protobuf_compiler/proto.gni
index 1e8e598..27c608f 100644
--- a/pw_protobuf_compiler/proto.gni
+++ b/pw_protobuf_compiler/proto.gni
@@ -67,10 +67,6 @@
       deps += [ get_label_info(dep, "label_no_toolchain") + "._gen" ]
     }
 
-    if (defined(invoker.plugin_deps)) {
-      deps += invoker.plugin_deps
-    }
-
     args = [
              "--language",
              invoker.language,
@@ -261,7 +257,7 @@
   _pw_invoke_protoc(target_name) {
     forward_variables_from(invoker, "*", _forwarded_vars)
     language = "python"
-    plugin_deps = [ "$dir_pw_protobuf_compiler:protobuf_requirements.install" ]
+    python_deps = [ "$dir_pw_protobuf_compiler:protobuf_requirements" ]
   }
 
   _setup_py = "${invoker.base_out_dir}/python/setup.py"