namespace_browser: Removing some unused Polymer dependencies Also closes https://github.com/veyron/release-issues/issues/1923
namespace_browser: Removing some unused Polymer dependencies
Also closes https://github.com/veyron/release-issues/issues/1923

Change-Id: If4577926ea80a10fc8fb68fd07793c9dc4af90ae

vanadium/browser,vanadium/browser,vanadium/browser,vanadium/browser