Print Preview tests: Remove unnecessary C++ class definition

chrome/test/data/webui/print_preview.h

Index: chrome/test/data/webui/print_preview.h
diff --git a/chrome/test/data/webui/print_preview.h b/chrome/test/data/webui/print_preview.h
deleted file mode 100644
index 66004f823add17fd50b7aa2c9ef701623eafe519..0000000000000000000000000000000000000000
--- a/chrome/test/data/webui/print_preview.h
+++ /dev/null
@@ -1,20 +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_TEST_DATA_WEBUI_PRINT_PREVIEW_H_
-#define CHROME_TEST_DATA_WEBUI_PRINT_PREVIEW_H_
-
-#include "base/macros.h"
-#include "chrome/test/base/web_ui_browser_test.h"
-
-class PrintPreviewWebUITest : public WebUIBrowserTest {
- public:
-  PrintPreviewWebUITest();
-  ~PrintPreviewWebUITest() override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PrintPreviewWebUITest);
-};
-
-#endif  // CHROME_TEST_DATA_WEBUI_PRINT_PREVIEW_H_