Move optional.h to webrtc/api/

webrtc/test/testsupport/fileutils_unittest.cc

 /*
  *  Copyright (c) 2012 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 "webrtc/test/testsupport/fileutils.h"
 
 #include <stdio.h>
 
 #include <fstream>
 #include <iostream>
 #include <list>
 #include <string>
 
+#include "webrtc/api/optional.h"
 #include "webrtc/rtc_base/checks.h"
-#include "webrtc/rtc_base/optional.h"
 #include "webrtc/rtc_base/pathutils.h"
 #include "webrtc/test/gtest.h"
 
 #ifdef WIN32
 #define chdir _chdir
 static const char* kPathDelimiter = "\\";
 #else
 static const char* kPathDelimiter = "/";
 #endif
 
@@ skipping 199 matching lines @@
   EXPECT_TRUE(dir_content);
   EXPECT_EQ(2u, dir_content->size());
   EXPECT_NO_FATAL_FAILURE(CleanDir(temp_directory, &num_deleted_entries));
   EXPECT_EQ(2u, num_deleted_entries);
   EXPECT_TRUE(RemoveDir(temp_directory));
   EXPECT_FALSE(DirExists(temp_directory));
 }
 
 }  // namespace test
 }  // namespace webrtc