Support of specify local prebuilt network service apptests file.

Support of specify local prebuilt network service apptests file.

Same as https://codereview.chromium.org/983143003, we need specify
network_service_apptests.mojo as well.

BUG=472609
Committed: https://crrev.com/78d4a7e127b51a315bbb0b26aadd7e601a50e50f
Cr-Commit-Position: refs/heads/master@{#323656}

[haltonhuo, 2015-04-01 11:40:50]

halton.huo@intel.com changed reviewers:
+ cjhopman@chromium.org, qsr@chromium.org

[haltonhuo, 2015-04-01 12:44:06]

The mojo counter-part CL is https://codereview.chromium.org/1056503002/

[qsr, 2015-04-02 09:00:28]

lgtm

[cjhopman, 2015-04-02 16:30:57]

lgtm

[haltonhuo, 2015-04-02 23:03:42]

The CQ bit was checked by halton.huo@intel.com

[haltonhuo, 2015-04-02 23:27:09]

The CQ bit was unchecked by halton.huo@intel.com

[haltonhuo, 2015-04-02 23:27:10]

The CQ bit was checked by halton.huo@intel.com

[haltonhuo, 2015-04-02 23:27:16]

The CQ bit was unchecked by halton.huo@intel.com

[haltonhuo, 2015-04-02 23:27:16]

The CQ bit was checked by halton.huo@intel.com

[commit-bot: I haz the power, 2015-04-03 00:54:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1048413002/20001

[commit-bot: I haz the power, 2015-04-03 07:42:24]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-03 20:33:48]

Patchset 2 (id:??) landed as
https://crrev.com/78d4a7e127b51a315bbb0b26aadd7e601a50e50f
Cr-Commit-Position: refs/heads/master@{#323656}