Make Power(Create|Set|Clear)Request direct calls
Make Power(Create|Set|Clear)Request direct calls

Previously had to be GetProcAddress()d for pre-Win7, but we no longer
run on pre-Win7.

BUG=579196

Review-Url: https://codereview.chromium.org/1928593003
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#390231}

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