Send the index in the canonical list over IPC when using the OOP plugin loader.

content/browser/plugin_loader_posix.h

Index: content/browser/plugin_loader_posix.h
diff --git a/content/browser/plugin_loader_posix.h b/content/browser/plugin_loader_posix.h
index 06514508c5cb97c1363b0b5f558d1b04c9def17c..40b079e1f9b6a045b1e4da95f5edca41f7c5eeab 100644
--- a/content/browser/plugin_loader_posix.h
+++ b/content/browser/plugin_loader_posix.h
@@ -77,8 +77,8 @@ class CONTENT_EXPORT PluginLoaderPosix : public UtilityProcessHost::Client,
   virtual void LoadPluginsInternal();
 
   // Message handlers.
-  void OnPluginLoaded(const webkit::WebPluginInfo& plugin);
-  void OnPluginLoadFailed(const FilePath& plugin_path);
+  void OnPluginLoaded(size_t index, const webkit::WebPluginInfo& plugin);
+  void OnPluginLoadFailed(size_t index, const FilePath& plugin_path);
 
   // Checks if the plugin path is an internal plugin, and, if it is, adds it to
   // |loaded_plugins_|.