Delete the NPAPI plugin browsertests.

content/test/plugin/plugin_delete_plugin_in_stream_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_STREAM_TEST_H_
-#define CONTENT_TEST_PLUGIN_PLUGIN_DELETE_PLUGIN_IN_STREAM_TEST_H_
-
-#include "base/compiler_specific.h"
-#include "content/test/plugin/plugin_test.h"
-
-namespace NPAPIClient {
-
-// This class tests
-class DeletePluginInStreamTest : public PluginTest {
- public:
-  // Constructor.
-  DeletePluginInStreamTest(NPP id, NPNetscapeFuncs *host_functions);
-  //
-  // NPAPI functions
-  //
-  NPError SetWindow(NPWindow* pNPWindow) override;
-  NPError NewStream(NPMIMEType type,
-                    NPStream* stream,
-                    NPBool seekable,
-                    uint16* stype) override;
-
- private:
-  bool test_started_;
-  std::string self_url_;
-};
-
-}  // namespace NPAPIClient
-
-#endif  // CONTENT_TEST_PLUGIN_PLUGIN_DELETE_PLUGIN_IN_STREAM_TEST_H_