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Now ScopedFeatureList::InitWithFeatures() takes vectors instead of
initializer_lists, we can make this much simpler.

Change-Id: Iaa807df1873ce5bf4215d1523dd53de4b0819b7f
Reviewed-on: https://chromium-review.googlesource.com/964934Reviewed-by: John Rummell <jrummell@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544186}