chrome: Cleanup class/struct forward declarations

chrome/browser/media/wv_test_license_server_config.h

 // Copyright 2014 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_BROWSER_MEDIA_WV_TEST_LICENSE_SERVER_CONFIG_H_
 #define CHROME_BROWSER_MEDIA_WV_TEST_LICENSE_SERVER_CONFIG_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "chrome/browser/media/test_license_server_config.h"
 
+namespace base {
+class FilePath;
+}
+
 // License configuration to run the Widevine test license server.
 class WVTestLicenseServerConfig : public TestLicenseServerConfig {
  public:
   WVTestLicenseServerConfig();
   ~WVTestLicenseServerConfig() override;
 
   std::string GetServerURL() override;
 
   bool GetServerCommandLine(base::CommandLine* command_line) override;
 
@@ skipping 11 matching lines @@
   // <license_server_root_path>/<platform>/
   void GetLicenseServerPath(base::FilePath* path);
 
   // Sets the server port to a randomly available port within a limited range.
   bool SelectServerPort();
 
   DISALLOW_COPY_AND_ASSIGN(WVTestLicenseServerConfig);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_WV_TEST_LICENSE_SERVER_CONFIG_H_