GN: toolchain threading cleanup

tools/gn/target.h

Index: tools/gn/target.h
diff --git a/tools/gn/target.h b/tools/gn/target.h
index d5c1af33305308049d4ac8fbce4e9767c4c83f18..13b278c781f89e2de7cc3e3e207161ad1acada51 100644
--- a/tools/gn/target.h
+++ b/tools/gn/target.h
@@ -58,8 +58,6 @@ class Target : public Item {
   bool HasBeenGenerated() const;
   void SetGenerated(const Token* token);
 
-  const Settings* settings() const { return settings_; }
-
   OutputType output_type() const { return output_type_; }
   void set_output_type(OutputType t) { output_type_ = t; }
 
@@ -149,7 +147,6 @@ class Target : public Item {
   // dependencies have been resolved.
   void PullDependentTargetInfo(std::set<const Config*>* unique_configs);
 
-  const Settings* settings_;
   OutputType output_type_;
   std::string output_name_;