Fix and enable java validation tests.

Fix and enable java validation tests.

Passing invalid handle was incorrect, because some handle were supposed
to be not null. Change the test to use mock handles instead.

NOTRY=true
R=ppi@chromium.org

Committed: https://crrev.com/61ac9f51a58bdfc97f8e2624b1496cc208247ed4
Cr-Commit-Position: refs/heads/master@{#293287}

[ppi, 2014-09-04 11:38:43]

lgtm, maybe edit the title to say "fix and enable"

[qsr, 2014-09-04 11:40:37]

The CQ bit was checked by qsr@chromium.org

[commit-bot: I haz the power, 2014-09-04 11:42:26]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/qsr@chromium.org/541633003/1

[commit-bot: I haz the power, 2014-09-04 11:44:56]

Committed patchset #1 (id:1) as 5685ab14f382e2c5940e27b9d14fc10c0fdfec7d

[commit-bot: I haz the power, 2014-09-10 03:31:01]

Patchset 1 (id:??) landed as
https://crrev.com/61ac9f51a58bdfc97f8e2624b1496cc208247ed4
Cr-Commit-Position: refs/heads/master@{#293287}