Refactor WavWriter to use FileWrapper rather than PlatformFile

Bug: webrtc:6463
Change-Id: I4c80995481ed7d5c1079450d04ed7958fa137e84
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/141662
Reviewed-by: Henrik Grunell <henrikg@webrtc.org>
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28279}
diff --git a/common_audio/BUILD.gn b/common_audio/BUILD.gn
index 4729e13..0dd5ec3 100644
--- a/common_audio/BUILD.gn
+++ b/common_audio/BUILD.gn
@@ -54,6 +54,7 @@
     "../rtc_base/memory:aligned_array",
     "../rtc_base/memory:aligned_malloc",
     "../rtc_base/system:arch",
+    "../rtc_base/system:file_wrapper",
     "../system_wrappers",
     "../system_wrappers:cpu_features_api",
     "third_party/fft4g",