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We apply EnablePlayStoreAppSearch to decide whether to:

- search for uninstalled apps from Play Store;
- show a proper badge in the Play Store app result;
- show the review score and price of every searched app.

Currently using the IsFullscreenAppListEnabled flag is incorrect.

BUG=736552

Review-Url: https://codereview.chromium.org/2961923002
Cr-Commit-Position: refs/heads/master@{#485454}