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If the only reference to a ReadableStreamDefaultReader is from
javascript code that is used as fulfillment handler for its "read"
promise the reader can get garbage collected, resulting in the promise
never resolving. This fixes that issue by making
ReadableStreamDefaultReader implement HasPendingActivity to return true
if there are any pending read promises.

Bug: 1092048
Change-Id: Iccf2d6db453c6a27c82542af7a1dc1a2d792c3ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561043Reviewed-by: Adam Rice <ricea@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832599}