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Use InAtomicMarkingPause to remove GCForbidenScope and NoAllocationScope usage

Change-Id: If723098063ea02d80dee0ae38257cdfa40959d66
Reviewed-on: https://chromium-review.googlesource.com/978792
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546002}