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There was a sligh difference in how status=test and status=experimental were
handled. Content turned on experimental features before initializing webkit and
the content shell enabled test features *after* webkit was started. This is a
problem when the feature alters webkit initialization.

This cl moves enabling test features to the place where experimental features
are enabled.

BUG=268240
LOG=no

Review-Url: https://codereview.chromium.org/2345233002
Cr-Commit-Position: refs/heads/master@{#419192}