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Only one ScopedFeatureList::InitXXX function should be called on
a particular ScopedFeatureList instance. If any Init functions are
called more than once, it will hit DCHECK(!init_called_) in
ScopedFeatureList::InitWithFeaturesImpl.

Refactor feature enabling so that the desired features are sent as
a vector of features in one call to ScopedFeatureList::InitWithFeatures

TEST=video_encode_accelerator_unittest does not hit DCHECK
BUG=none

Change-Id: I445ea51740b93361c771450e47cd31300ae13c69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862257Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Drew Davenport <ddavenport@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706126}