Add placeholder text for unsupported plug-ins.

chrome/renderer/plugins/plugin_placeholder.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_RENDERER_PLUGINS_PLUGIN_PLACEHOLDER_H_
 #define CHROME_RENDERER_PLUGINS_PLUGIN_PLACEHOLDER_H_
 
 #include "content/public/renderer/context_menu_client.h"
 #include "content/public/renderer/render_process_observer.h"
 #include "content/public/renderer/render_view_observer.h"
@@ skipping 117 matching lines @@
   // Opens chrome://plugins in a new tab.
   // Takes no arguments, and returns nothing.
   void OpenAboutPluginsCallback(const webkit_glue::CppArgumentList& args,
                                 webkit_glue::CppVariant* result);
 
   void DidFinishLoadingCallback(const webkit_glue::CppArgumentList& args,
                                 webkit_glue::CppVariant* result);
 
   void OnLoadBlockedPlugins(const std::string& identifier);
   void OnSetIsPrerendering(bool is_prerendering);
+#if defined(ENABLE_PLUGIN_INSTALLATION)
   void OnDidNotFindMissingPlugin();
-#if defined(ENABLE_PLUGIN_INSTALLATION)
   void OnFoundMissingPlugin(const string16& plugin_name);
   void OnStartedDownloadingPlugin();
   void OnFinishedDownloadingPlugin();
   void OnErrorDownloadingPlugin(const std::string& error);
   void OnCancelledDownloadingPlugin();
 #endif
 
 #if defined(ENABLE_MOBILE_YOUTUBE_PLUGIN)
  // Check whether the url is valid.
   static bool IsValidYouTubeVideo(const std::string& path);
@@ skipping 34 matching lines @@
   bool has_host_;
   bool finished_loading_;
   string16 plugin_name_;
   std::string identifier_;
   int context_menu_request_id_;  // Nonzero when request pending.
 
   DISALLOW_COPY_AND_ASSIGN(PluginPlaceholder);
 };
 
 #endif  // CHROME_RENDERER_PLUGINS_PLUGIN_PLACEHOLDER_H_