Temporarily add hook for extending net_java_test_support.

Temporarily add hook for extending net_java_test_support.

Defines a list 'net_test_extra_libs' that is included in
net_java_test_support. org.apache.http is deprecated and being removed.
This enables temporary inclusion of a replacement jar until the
dependency is removed.

BUG=488192
Committed: https://crrev.com/05fc830812d2cbed9c438918150f884b6dc91075
Cr-Commit-Position: refs/heads/master@{#330105}

[Yaron, 2015-05-15 00:50:19]

yfriedman@chromium.org changed reviewers:
+ asanka@chromium.org

[asanka, 2015-05-15 14:44:51]

lgtm

[Yaron, 2015-05-15 14:50:14]

The CQ bit was checked by yfriedman@chromium.org

[commit-bot: I haz the power, 2015-05-15 14:51:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1138013007/20001

[Yaron, 2015-05-15 15:54:05]

The CQ bit was unchecked by yfriedman@chromium.org

[Yaron, 2015-05-15 15:54:10]

The CQ bit was checked by yfriedman@chromium.org

[commit-bot: I haz the power, 2015-05-15 16:00:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1138013007/20001

[commit-bot: I haz the power, 2015-05-15 16:31:41]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-15 16:32:33]

Patchset 2 (id:??) landed as
https://crrev.com/05fc830812d2cbed9c438918150f884b6dc91075
Cr-Commit-Position: refs/heads/master@{#330105}