Move feature policy vibrate tests to correct directory

vibrate is not behind the flag FeaturePolicyExpeirmentalFeatures, so
move the virtual tests to feature-policy-experiment-features/ from
feature-policy/

BUG=710850

Review-Url: https://codereview.chromium.org/2814153002
Cr-Commit-Position: refs/heads/master@{#466634}
21 files changed