Cleanup: Remove unused dependency on NaCl src/trusted/gio target

Cleanup: Remove unused dependency on NaCl src/trusted/gio target

ppapi/ no longer has any references to NaCl's "Gio" code.

This cleanup will allow the Gyp file to be removed from the NaCl side.

BUG=none
TEST=build

Committed: https://crrev.com/51edc1f09281700703dd1c76ec4cfa0bc03b1e09
Cr-Commit-Position: refs/heads/master@{#296323}

[Mark Seaborn, 2014-09-23 23:09:10]

mseaborn@chromium.org changed reviewers:
+ teravest@chromium.org

[teravest, 2014-09-23 23:11:54]

lgtm

[Mark Seaborn, 2014-09-23 23:12:24]

The CQ bit was checked by mseaborn@chromium.org

[commit-bot: I haz the power, 2014-09-23 23:14:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/593243003/1

[commit-bot: I haz the power, 2014-09-23 23:59:32]

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

[commit-bot: I haz the power, 2014-09-23 23:59:33]

Try jobs failed on following builders:
  ios_rel_device on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device/bu...)

[Mark Seaborn, 2014-09-24 01:36:44]

The CQ bit was checked by mseaborn@chromium.org

[commit-bot: I haz the power, 2014-09-24 01:38:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/593243003/1

[commit-bot: I haz the power, 2014-09-24 01:43:11]

Committed patchset #1 (id:1) as f103a19c044dbf932919a9b15f292d89ed5bd3c3

[commit-bot: I haz the power, 2014-09-24 01:43:42]

Patchset 1 (id:??) landed as
https://crrev.com/51edc1f09281700703dd1c76ec4cfa0bc03b1e09
Cr-Commit-Position: refs/heads/master@{#296323}