Add missing GYP deps for browser_sync_browser_test_support
Add missing GYP deps for browser_sync_browser_test_support

This adds dependencies for //components/browser_sync/browser test support,
which are missing in GYP but present in GN.

BUG=581640,588464

Review URL: https://codereview.chromium.org/1721643002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#376727}

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