Reland of Further reduction of feature_compiler.py generated code

extensions/common/features/base_feature_provider.h

Index: extensions/common/features/base_feature_provider.h
diff --git a/extensions/common/features/base_feature_provider.h b/extensions/common/features/base_feature_provider.h
index 5b6be3d3ce76d79a7673fd467e76f878a1a13d74..1b840f393ca6141c3554b729e640cb2c2c43cfa9 100644
--- a/extensions/common/features/base_feature_provider.h
+++ b/extensions/common/features/base_feature_provider.h
@@ -41,6 +41,10 @@
 
   void AddFeature(base::StringPiece name, std::unique_ptr<Feature> feature);
 
+  // Takes ownership. Used in preference to unique_ptr variant to reduce size
+  // of generated code.
+  void AddFeature(base::StringPiece name, Feature* feature);
+
  private:
   std::map<std::string, std::unique_ptr<Feature>> features_;