Switch android to build with safe_browsing=3 mode, now that the required GMSCore client lib has landed.
Switch android to build with safe_browsing=3 mode,
now that the required GMSCore client lib has landed.

This compiles in the support for safe browsing, but functionality is
gated by the AndroidSafeBrowsing field trial that is
disabled by default.

BUG=474608

Review URL: https://codereview.chromium.org/1290153002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#343306}

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