Pepper: Remove jsoncpp from trusted plugin.

Pepper: Remove jsoncpp from trusted plugin.

Now that manifest parsing has been moved to components/nacl, the trusted plugin
no longer depends on jsoncpp.

BUG=239656
R=dmichael@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272174

[dmichael (off chromium), 2014-05-21 19:55:52]

lgtm!!

[teravest, 2014-05-21 21:25:39]

The CQ bit was checked by teravest@chromium.org

[commit-bot: I haz the power, 2014-05-21 21:29:38]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/teravest@chromium.org/291173007/20001

[commit-bot: I haz the power, 2014-05-22 13:59:48]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[commit-bot: I haz the power, 2014-05-22 14:01:50]

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

[commit-bot: I haz the power, 2014-05-22 14:01:50]

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

[teravest, 2014-05-22 14:04:10]

Committed patchset #2 manually as r272174 (presubmit successful).