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Currently when we copy over a StyleRule we parse all proeprties
greedily. This should only be the already parsed properties. The greedy
method may result in a dangerous state.

This is a speculative fix for the ClusterFuzz issue.

Bug: 774061
Change-Id: I0b7f09018c7cf2d8ca75ea5d705016fbcce6f0ae
Reviewed-on: https://chromium-review.googlesource.com/722579Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: nainar <nainar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509352}