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As stated in https://crbug.com/929849#c58, there may be a risk to enable low
power encoder by default. We should perform A/B test via finch. This CL
disables the feature by default, which follows chrome feature release procedure.

Bug: 929849
Test: Confirm EncSliceLP is not used in appr.tc on sarien
Change-Id: I34638d0490d20746cbd630c5cc7bbc8c647b75f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1545437
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646650}