mojo: Move initialization of the embedder in java.

mojo: Move initialization of the embedder in java.

The embedder was initialized in the constructor of CoreImpl. This is not
correct, because when it will be used in Chromium, the embedder is
initialized by the native code.

This remove the initialization from CoreImpl. Instead, for tests,
initialize it when loading the native library.

R=ppi@chromium.org

Committed: https://crrev.com/009487f75b3905bf759c8b4430fed474f3d5b04e
Cr-Commit-Position: refs/heads/master@{#293475}

[ppi, 2014-09-04 11:43:43]

lgtm

[qsr, 2014-09-04 11:50:49]

The CQ bit was checked by qsr@chromium.org

[commit-bot: I haz the power, 2014-09-04 11:52:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/qsr@chromium.org/544603002/1

[qsr, 2014-09-04 15:26:27]

The CQ bit was unchecked by qsr@chromium.org

[qsr, 2014-09-04 15:26:30]

The CQ bit was checked by qsr@chromium.org

[commit-bot: I haz the power, 2014-09-04 15:26:54]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/qsr@chromium.org/544603002/1

[commit-bot: I haz the power, 2014-09-04 18:52:53]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-04 18:52:54]

Try jobs failed on following builders:
  mac_gpu_retina_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu_retina_tr...)

[qsr, 2014-09-05 08:13:39]

The CQ bit was checked by qsr@chromium.org

[commit-bot: I haz the power, 2014-09-05 08:19:28]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/qsr@chromium.org/544603002/1

[commit-bot: I haz the power, 2014-09-05 08:21:07]

Committed patchset #1 (id:1) as 58ffd3812a2a49e7dcd201c1eaebe6c0e85e70f1

[commit-bot: I haz the power, 2014-09-10 03:37:58]

Patchset 1 (id:??) landed as
https://crrev.com/009487f75b3905bf759c8b4430fed474f3d5b04e
Cr-Commit-Position: refs/heads/master@{#293475}