Use same base class for popup and plugin blocking UI

chrome/browser/content_settings/tab_specific_content_settings.h

Index: chrome/browser/content_settings/tab_specific_content_settings.h
diff --git a/chrome/browser/content_settings/tab_specific_content_settings.h b/chrome/browser/content_settings/tab_specific_content_settings.h
index 2a6705b1473ab2a96b5aa63e38b6e0c4196d6117..8851b8945d7f932d3733e46b0513a708fd6d0a80 100644
--- a/chrome/browser/content_settings/tab_specific_content_settings.h
+++ b/chrome/browser/content_settings/tab_specific_content_settings.h
@@ -180,7 +180,9 @@ class TabSpecificContentSettings
   bool IsContentAllowed(ContentSettingsType content_type) const;
 
   // Returns the names of plugins that have been blocked for this tab.
-  const base::string16 GetBlockedPluginNames() const;
+  const std::vector<base::string16>& blocked_plugin_names() const {
+    return blocked_plugin_names_;
+  }
 
   const GURL& media_stream_access_origin() const {
     return media_stream_access_origin_;