Make the Mac build work.

tools/gn/config_values_generator.h

Index: tools/gn/config_values_generator.h
diff --git a/tools/gn/config_values_generator.h b/tools/gn/config_values_generator.h
index 79d90678dbb831d5b091e45eda45fcfbae7897d5..fb5bf750cea55f9a8a78920d072549baf9d391c1 100644
--- a/tools/gn/config_values_generator.h
+++ b/tools/gn/config_values_generator.h
@@ -19,7 +19,7 @@ class Token;
 class ConfigValuesGenerator {
  public:
   ConfigValuesGenerator(ConfigValues* dest_values,
-                        const Scope* scope,
+                        Scope* scope,
                         const Token& function_token,
                         const SourceDir& input_dir,
                         Err* err);
@@ -29,15 +29,10 @@ class ConfigValuesGenerator {
   void Run();
 
  private:
-  void FillDefines();
   void FillIncludes();
-  void FillCflags();
-  void FillCflags_C();
-  void FillCflags_CC();
-  void FillLdflags();
 
   ConfigValues* config_values_;
-  const Scope* scope_;
+  Scope* scope_;
   const Token& function_token_;
   const SourceDir input_dir_;
   Err* err_;