Delete rtc::File, usage replaced with FileWrapper

Bug: webrtc:6463
Change-Id: Ia0767a2e6bbacc43e63c30ed3bd3edb10ff6e645
Reviewed-on: https://webrtc-review.googlesource.com/c/121943
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26613}

modules/video_coding/codecs/test/videocodec_test_fixture_impl.cc

@@ -39,7 +39,6 @@
 #include "rtc_base/checks.h"
 #include "rtc_base/cpu_time.h"
 #include "rtc_base/event.h"
-#include "rtc_base/file.h"
 #include "rtc_base/strings/string_builder.h"
 #include "rtc_base/time_utils.h"
 #include "system_wrappers/include/cpu_info.h"
@@ -617,8 +616,8 @@ void VideoCodecTestFixtureImpl::SetUpAndInitObjects(
                                              std::to_string(simulcast_svc_idx);
 
     if (config_.visualization_params.save_encoded_ivf) {
-      rtc::File post_encode_file =
-          rtc::File::Create(output_filename_base + ".ivf");
+      FileWrapper post_encode_file =
+          FileWrapper::OpenWriteOnly(output_filename_base + ".ivf");
       encoded_frame_writers_.push_back(
           IvfFileWriter::Wrap(std::move(post_encode_file), 0));
     }