Adding <keygen> Content Setting (Blink)

chrome/renderer/content_settings_observer.h

Index: chrome/renderer/content_settings_observer.h
diff --git a/chrome/renderer/content_settings_observer.h b/chrome/renderer/content_settings_observer.h
index 37a70438c0c6657565877e219ac6202eb6b463ff..3559a324565989ab7bfbdf5c07c0c34a25d2fd87 100644
--- a/chrome/renderer/content_settings_observer.h
+++ b/chrome/renderer/content_settings_observer.h
@@ -77,6 +77,7 @@ class ContentSettingsObserver
   bool allowMutationEvents(bool default_value) override;
   void didNotAllowPlugins() override;
   void didNotAllowScript() override;
+  void usedKeygen() override;
   bool allowDisplayingInsecureContent(bool allowed_per_settings,
                                       const blink::WebSecurityOrigin& context,
                                       const blink::WebURL& url) override;
@@ -143,14 +144,14 @@ class ContentSettingsObserver
   // |SetContentSettingRules|.
   const RendererContentSettingRules* content_setting_rules_;
 
-  // Stores if images, scripts, and plugins have actually been blocked.
+  // Stores if images, scripts, keygen, and plugins have actually been blocked.
   std::map<ContentSettingsType, bool> content_blocked_;
 
   // Caches the result of AllowStorage.
   typedef std::pair<GURL, bool> StoragePermissionsKey;
   std::map<StoragePermissionsKey, bool> cached_storage_permissions_;
 
-  // Caches the result of |AllowScript|.
+  // Caches the result of AllowScript.
   std::map<blink::WebFrame*, bool> cached_script_permissions_;
 
   std::set<std::string> temporarily_allowed_plugins_;