Clean up plug-in placeholders:

chrome/renderer/plugins/plugin_placeholder.h

+// Copyright (c) 2011 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_
+#pragma once
+
+#include "content/public/renderer/render_view_observer.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginParams.h"
+#include "webkit/glue/cpp_bound_class.h"
+#include "webkit/plugins/npapi/webview_plugin.h"
+
+namespace webkit {
+struct WebPluginInfo;
+}
+
+class PluginPlaceholder : public content::RenderViewObserver,

[battre, 2011/11/22 09:57:15]

Add a short description of this class? Why would you want to use a placeholder?
Is this a generic wrapper or do you use it only in some cases?

[Bernhard Bauer, 2011/11/22 17:04:49]

Done.

+                          public CppBoundClass,
+                          public webkit::npapi::WebViewPlugin::Delegate {
+ protected:
+  PluginPlaceholder(content::RenderView* render_view,

[battre, 2011/11/22 09:57:15]

Document owernship of passed pointers?

[Bernhard Bauer, 2011/11/22 17:04:49]

Done.

+                    WebKit::WebFrame* frame,
+                    const WebKit::WebPluginParams& params,
+                    const std::string& html_data);
+  virtual ~PluginPlaceholder();
+
+  webkit::npapi::WebViewPlugin* plugin() { return plugin_; }
+  WebKit::WebFrame* frame() { return frame_; }
+
+  void LoadPlugin(const webkit::WebPluginInfo& plugin_info);

[battre, 2011/11/22 09:57:15]

Please rename these functions if they occur with the same name in the derived
classes. Maybe LoadPluginImpl?

[Bernhard Bauer, 2011/11/22 17:04:49]

...Internal?

+  void HidePlugin();
+
+  // WebViewPlugin::Delegate methods:
+  virtual void BindWebFrame(WebKit::WebFrame* frame) OVERRIDE;
+  virtual void WillDestroyPlugin() OVERRIDE;
+
+ private:
+  WebKit::WebFrame* frame_;
+  WebKit::WebPluginParams plugin_params_;
+  webkit::npapi::WebViewPlugin* plugin_;
+
+  DISALLOW_COPY_AND_ASSIGN(PluginPlaceholder);
+};
+
+#endif  // CHROME_RENDERER_PLUGINS_PLUGIN_PLACEHOLDER_H_