Move optional.h to webrtc/api/

webrtc/test/testsupport/fileutils.h

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include <stdio.h>
 
 #ifndef WEBRTC_TEST_TESTSUPPORT_FILEUTILS_H_
 #define WEBRTC_TEST_TESTSUPPORT_FILEUTILS_H_
 
 #include <string>
 #include <vector>
 
-#include "webrtc/rtc_base/optional.h"
+#include "webrtc/api/optional.h"
 
 namespace webrtc {
 namespace test {
 
 // This is the "directory" returned if the ProjectPath() function fails
 // to find the project root.
 extern const char* kCannotFindProjectRootDir;
 
 // Creates and returns the absolute path to the output directory where log files
 // and other test artifacts should be put. The output directory is generally a
@@ skipping 71 matching lines @@
 // but can also be an absolute path. The intention with this function is to pass
 // the argv[0] being sent into the main function to make it possible for
 // fileutils.h to find the correct project paths even when the working directory
 // is outside the project tree (which happens in some cases).
 void SetExecutablePath(const std::string& path_to_executable);
 
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_TEST_TESTSUPPORT_FILEUTILS_H_