Delete the NPAPI plugin browsertests.

content/test/plugin/plugin_delete_plugin_in_deallocate_test.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 CONTENT_TEST_PLUGIN_PLUGIN_DELETE_PLUGIN_IN_DEALLOCATE_TEST_H_
-#define CONTENT_TEST_PLUGIN_PLUGIN_DELETE_PLUGIN_IN_DEALLOCATE_TEST_H_
-
-#include "base/compiler_specific.h"
-#include "content/test/plugin/plugin_test.h"
-
-namespace NPAPIClient {
-
-// This test verifies that if a plugin scripts the page from within an
-// NPObject's deallocation, and the page tears down the plugin, then that
-// object doesn't end up being double-freed.
-
-class DeletePluginInDeallocateTest : public PluginTest {
- public:
-  // Constructor.
-  DeletePluginInDeallocateTest(NPP id, NPNetscapeFuncs* host_functions);
-
-  // NPAPI handlers.
-  NPError SetWindow(NPWindow* pNPWindow) override;
-  NPError Destroy() override;
-
-  NPObject* npobject_;
-  bool test_started_;
-};
-
-}  // namespace NPAPIClient
-
-#endif  // CONTENT_TEST_PLUGIN_PLUGIN_DELETE_PLUGIN_IN_DEALLOCATE_TEST_H_