RefCounted types should not have public destructors, chrome/browser/extensions

chrome/browser/extensions/extension_info_map.h

Index: chrome/browser/extensions/extension_info_map.h
diff --git a/chrome/browser/extensions/extension_info_map.h b/chrome/browser/extensions/extension_info_map.h
index 8b00664291381025d0fd4b993708ccf885ec1f1c..df8a6c5fe2e474184677b42d2013636afae4841b 100644
--- a/chrome/browser/extensions/extension_info_map.h
+++ b/chrome/browser/extensions/extension_info_map.h
@@ -25,7 +25,6 @@ class Extension;
 class ExtensionInfoMap : public base::RefCountedThreadSafe<ExtensionInfoMap> {
  public:
   ExtensionInfoMap();
-  ~ExtensionInfoMap();
 
   const ExtensionSet& extensions() const { return extensions_; }
   const ExtensionSet& disabled_extensions() const {
@@ -74,11 +73,15 @@ class ExtensionInfoMap : public base::RefCountedThreadSafe<ExtensionInfoMap> {
   ExtensionsQuotaService* GetQuotaService();
 
  private:
+  friend class base::RefCountedThreadSafe<ExtensionInfoMap>;
+
   // Extra dynamic data related to an extension.
   struct ExtraData;
   // Map of extension_id to ExtraData.
   typedef std::map<std::string, ExtraData> ExtraDataMap;
 
+  ~ExtensionInfoMap();
+
   ExtensionSet extensions_;
   ExtensionSet disabled_extensions_;