[Code Health] Use base::HeapArray in ppapi/proxy/file_io_resource.cc

Bug: 326458693, 326459114
Change-Id: I2b6db6980c4fea1dd94dc8364c7602546dc51d55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5626931
Commit-Queue: Nan Lin <linnan@chromium.org>
Reviewed-by: Derek Schuff <dschuff@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1315946}
NOKEYCHECK=True
GitOrigin-RevId: c8d265c23bf030d1ef2415ea0dacd4a35dc579b8
2 files changed