Switch android to build with safe_browsing=3 mode.

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
Committed: https://crrev.com/1587e02948b25f38f4fb9ecfdec715e3d8e18711
Cr-Commit-Position: refs/heads/master@{#343306}

[Nathan Parker, 2015-08-13 21:17:44]

nparker@chromium.org changed reviewers:
+ scottmg@chromium.org

[Nathan Parker, 2015-08-13 21:17:45]

I'll submit this after landing a fix to the clank gyp in
https://chrome-internal-review.googlesource.com/#/c/227165

[mattm, 2015-08-13 21:23:56]

mattm@chromium.org changed reviewers:
+ mattm@chromium.org

[mattm, 2015-08-13 21:23:56]

lgtm

[scottmg, 2015-08-13 21:31:52]

lgtm

[Nathan Parker, 2015-08-13 23:12:41]

The CQ bit was checked by nparker@chromium.org

[commit-bot: I haz the power, 2015-08-13 23:13:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1290153002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1290153002/1

[commit-bot: I haz the power, 2015-08-13 23:53:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-13 23:53:51]

Patchset 1 (id:??) landed as
https://crrev.com/1587e02948b25f38f4fb9ecfdec715e3d8e18711
Cr-Commit-Position: refs/heads/master@{#343306}