[Extensions Bindings] Add ChromeSetting custom type

extensions/renderer/storage_area.h

Index: extensions/renderer/storage_area.h
diff --git a/extensions/renderer/storage_area.h b/extensions/renderer/storage_area.h
index 159fd9e5f77657eb34e9d63cdbcfda9e933e1608..5906da20c9a9b511a6304844bb19764f7fb0af7c 100644
--- a/extensions/renderer/storage_area.h
+++ b/extensions/renderer/storage_area.h
@@ -5,7 +5,6 @@
 #ifndef EXTENSIONS_RENDERER_STORAGE_AREA_H_
 #define EXTENSIONS_RENDERER_STORAGE_AREA_H_
 
-#include <map>
 #include <string>
 
 #include "base/macros.h"
@@ -17,8 +16,8 @@ class Arguments;
 }
 
 namespace extensions {
+class APIEventHandler;
 class APIRequestHandler;
-class APISignature;
 class APITypeReferenceMap;
 
 // Implementation of the storage.StorageArea custom type used in the
@@ -35,28 +34,19 @@ class StorageArea {
       v8::Local<v8::Context> context,
       const std::string& property_name,
       APIRequestHandler* request_handler,
+      APIEventHandler* event_handler,
       APITypeReferenceMap* type_refs);
 
   void HandleFunctionCall(const std::string& method_name,
                           gin::Arguments* arguments);
 
  private:
-  // Returns the schema associated with the specified function.
-  // TODO(devlin): Other custom types will need this, too; move it out of here
-  // when more exist.
-  const APISignature& GetFunctionSchema(base::StringPiece api_name,
-                                        base::StringPiece type_name,
-                                        base::StringPiece function_name);
-
   APIRequestHandler* request_handler_;
 
   const APITypeReferenceMap* type_refs_;
 
   std::string name_;
 
-  // TODO(devlin): See GetFunctionSchema.
-  std::map<std::string, std::unique_ptr<APISignature>> signatures_;
-
   DISALLOW_COPY_AND_ASSIGN(StorageArea);
 };