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Because ProcessingInstruction::Process only invokes AddPendingSheet when !is_xsl_. If removing pending sheets, StyleEngine will not find whether all pending parser blocking stylesheets are loaded or not correctly.

Bug: 905827, 1035293
Change-Id: Id617c2001601bef6e4e867ea1a193d5b4e8a51fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978540Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Takashi Sakamoto <tasak@google.com>
Cr-Commit-Position: refs/heads/master@{#726724}