[vm/io] Avoid leaking Handle::data_ready_ on Windows. Handle::data_ready_ contains bytes which are ready to be sent to Dart side. Not all code paths fully drain this buffer and delete it before destroying the handle, for example directory watch implementation was prone to leaking data_ready_ when subscription was cancelled. This CL switches the code to use unique_ptr to hold on to data_ready_ which makes sure that it is deleted when Handle is destroyed. The code would benefit from holding all OverlappedBuffer instances through unique_ptr but that is a much larger refactoring which we leave for a later date. Fixes https://github.com/dart-lang/sdk/issues/52715 TEST=standalone{,_2}/regress_52715_test Bug: 52715 Cq-Include-Trybots: luci.dart.try:vm-win-release-x64-try,vm-win-debug-x64-try,vm-aot-win-release-x64-try,analyzer-win-release-try Change-Id: Ie8d728b823de7e8f9de1489898e270580c2af269 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/311841 Commit-Queue: Slava Egorov <vegorov@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com> Auto-Submit: Slava Egorov <vegorov@google.com>
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