Check whether the plugin is disabled in OnIsInternalPluginRegisteredForMimeType().

chrome/browser/plugins/plugin_info_message_filter.h

Index: chrome/browser/plugins/plugin_info_message_filter.h
diff --git a/chrome/browser/plugins/plugin_info_message_filter.h b/chrome/browser/plugins/plugin_info_message_filter.h
index c9987c5573e4306d32363541be5dc79deeb55e24..bcedfc377c78454262cbb82e2e116dd254618795 100644
--- a/chrome/browser/plugins/plugin_info_message_filter.h
+++ b/chrome/browser/plugins/plugin_info_message_filter.h
@@ -63,6 +63,7 @@ class PluginInfoMessageFilter : public content::BrowserMessageFilter {
                                  bool* is_managed) const;
     void MaybeGrantAccess(const ChromeViewHostMsg_GetPluginInfo_Status& status,
                           const base::FilePath& path) const;
+    bool IsPluginEnabled(const content::WebPluginInfo& plugin) const;
 
    private:
     int render_process_id_;
@@ -100,15 +101,16 @@ class PluginInfoMessageFilter : public content::BrowserMessageFilter {
                      const std::vector<content::WebPluginInfo>& plugins);
 
 #if defined(ENABLE_PEPPER_CDMS)
-  // Returns whether any internal plugin supporting |mime_type| is registered.
-  // Does not determine whether the plugin can actually be instantiated
-  // (e.g. whether it is allowed or has all its dependencies).
-  // When the returned *|is_registered| is true, |additional_param_names| and
+  // Returns whether any internal plugin supporting |mime_type| is registered
+  // and enabled. Does not determine whether the plugin can actually be
+  // instantiated (e.g. whether it has all its dependencies).
+  // When the returned *|is_available| is true, |additional_param_names| and
   // |additional_param_values| contain the name-value pairs, if any, specified
-  // for the *first* plugin found that is registered for |mime_type|.
-  void OnIsInternalPluginRegisteredForMimeType(
+  // for the *first* non-disabled plugin found that is registered for
+  // |mime_type|.
+  void OnIsInternalPluginAvailableForMimeType(
       const std::string& mime_type,
-      bool* is_registered,
+      bool* is_available,
       std::vector<base::string16>* additional_param_names,
       std::vector<base::string16>* additional_param_values);
 #endif