Remove content/public/plugin and chrome/plugin

chrome/plugin/chrome_content_plugin_client.h

Index: chrome/plugin/chrome_content_plugin_client.h
diff --git a/chrome/plugin/chrome_content_plugin_client.h b/chrome/plugin/chrome_content_plugin_client.h
deleted file mode 100644
index 0db09558333515a880376a4d82c06522556ef553..0000000000000000000000000000000000000000
--- a/chrome/plugin/chrome_content_plugin_client.h
+++ /dev/null
@@ -1,15 +0,0 @@
-// 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_PLUGIN_CHROME_CONTENT_PLUGIN_CLIENT_H_
-#define CHROME_PLUGIN_CHROME_CONTENT_PLUGIN_CLIENT_H_
-
-#include "content/public/plugin/content_plugin_client.h"
-
-class ChromeContentPluginClient : public content::ContentPluginClient {
- public:
-  void PreSandboxInitialization() override;
-};
-
-#endif  // CHROME_PLUGIN_CHROME_CONTENT_PLUGIN_CLIENT_H_