GitLab

One of the top crashers in net/ is out-of-memory with data URLs
that comes when the string is needlessly duplicated during
unescaping.  Looks like data URLs are being used to load fonts.
I'm unescaping in-place to avoid requiring two copies of the string.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I8724c62b254623e5025478b27388e42d5c4a1473
Reviewed-on: https://chromium-review.googlesource.com/1169635Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Taiju Tsuiki <tzik@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584404}