Remove content/public/plugin and chrome/plugin

content/public/plugin/content_plugin_client.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 CONTENT_PUBLIC_PLUGIN_CONTENT_PLUGIN_CLIENT_H_
-#define CONTENT_PUBLIC_PLUGIN_CONTENT_PLUGIN_CLIENT_H_
-
-#include "base/strings/string16.h"
-#include "content/public/common/content_client.h"
-
-namespace content {
-
-// Embedder API for participating in plugin logic.
-class CONTENT_EXPORT ContentPluginClient {
- public:
-  virtual ~ContentPluginClient() {}
-
-  // Called to perform any per-process initialization necessary before
-  // the sandbox is initialized for the plugin process.
-  virtual void PreSandboxInitialization() {}
-
-  // Notifies that a plugin process has started.
-  virtual void PluginProcessStarted(const base::string16& plugin_name) {}
-};
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_PLUGIN_CONTENT_PLUGIN_CLIENT_H_