Allow default SiteInstance to be completely disabled.
Refactors the code so that default SiteInstances won't be used anywhere when the kProcessSharingWithDefaultSiteInstances feature is not enabled. The old code would still allow default SiteInstances in some scenarios even if the feature was off. This is surprising and more an artifact of how the feature was incrementally developed instead of intended behavior. Bug: 1015882 Change-Id: I5c46487428d33d77f5706e0f7f3b7795251a1212 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877909 Commit-Queue: Alex Moshchuk <alexmos@chromium.org> Auto-Submit: Aaron Colwell <acolwell@chromium.org> Reviewed-by:Alex Moshchuk <alexmos@chromium.org> Cr-Commit-Position: refs/heads/master@{#709098}
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