Fix a crash when opening CronetTest app

Fix a crash when opening CronetTest app

If we install and open CronetTest app without CronetTestInstrumentation app,
CronetTest app will crash and complain that it cannot find
MockUrlRequestJobTest class. The reason is that this class is in
test/javatests/src/ and not in test/src/, so it does not get loaded to device
if we choose to only install and open CronetTest app.

BUG=415781
Committed: https://crrev.com/18a2ed23ddf0967ed4569d0eccd71ee2f0a56e91
Cr-Commit-Position: refs/heads/master@{#297261}

[xunjieli, 2014-09-26 15:04:07]

xunjieli@chromium.org changed reviewers:
+ mef@chromium.org, mmenke@chromium.org

[xunjieli, 2014-09-26 15:04:08]

Sorry that I introduce a crash in my last CL. This is a possible fix. PTAL.

[mef, 2014-09-26 15:19:56]

LGTM. Perfect timing, as I've hit this issue when I was trying to add debug
option to cr_cronet.py.

[mmenke, 2014-09-29 19:40:30]

On 2014/09/26 15:19:56, mef wrote:
> LGTM. Perfect timing, as I've hit this issue when I was trying to add debug
> option to cr_cronet.py.

LGTM as well

[xunjieli, 2014-09-29 19:42:44]

The CQ bit was checked by xunjieli@chromium.org

[commit-bot: I haz the power, 2014-09-29 19:44:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/612433002/1

[commit-bot: I haz the power, 2014-09-29 21:09:00]

Committed patchset #1 (id:1) as 49f167c710218657401d1f0522310dc99fafef83

[commit-bot: I haz the power, 2014-09-29 21:15:21]

Patchset 1 (id:??) landed as
https://crrev.com/18a2ed23ddf0967ed4569d0eccd71ee2f0a56e91
Cr-Commit-Position: refs/heads/master@{#297261}