Use core_services for network_service on Android

core_services: Also bundle network_service on android.

This creates an android_hooks.cc file, which we could currently share,
but probably won't want to long term, as every time we add something to
core_services, we'll have to merge their implementation in.

BUG=477435
Committed: https://crrev.com/355e3f1944627652131a7dc60bf1a92fd4c979ad
Cr-Commit-Position: refs/heads/master@{#329506}

[Elliot Glaysher, 2015-05-12 21:45:20]

erg@chromium.org changed reviewers:
+ ben@chromium.org

[Ben Goodger (Google), 2015-05-12 21:51:45]

lgtm

[Elliot Glaysher, 2015-05-12 21:55:55]

The CQ bit was checked by erg@chromium.org

[commit-bot: I haz the power, 2015-05-12 21:56:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1133543005/40001

[commit-bot: I haz the power, 2015-05-12 22:18:13]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-05-12 22:19:53]

Patchset 3 (id:??) landed as
https://crrev.com/355e3f1944627652131a7dc60bf1a92fd4c979ad
Cr-Commit-Position: refs/heads/master@{#329506}