Disable Nacl on Linux GN component builds.

Disable Nacl on Linux GN component builds.

This is a temporary workaround until the other fixes for bug
482415 can land. This shouldn't affect any of the bots, as
the only component GN Linux build we have is also a debug build,
so NaCl was already disabled.

TBR=brettw@chromium.org, bbudge@chromium.org
BUG=482415
Committed: https://crrev.com/1feead57e3a71bbdad4775899b19d0b173ffc7e7
Cr-Commit-Position: refs/heads/master@{#327604}

[Dirk Pranke, 2015-04-29 22:33:24]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-04-29 22:35:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1104303003/1

[commit-bot: I haz the power, 2015-04-29 23:00:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-29 23:01:01]

Patchset 1 (id:??) landed as
https://crrev.com/1feead57e3a71bbdad4775899b19d0b173ffc7e7
Cr-Commit-Position: refs/heads/master@{#327604}