Remove incorrect dependency from chromeos.gyp

Remove incorrect dependency from chromeos.gyp

During a refactoring (https://codereview.chromium.org/402403004/) by mistake a dependency of chromeos_unittests on test_support_content was added.
This increased the number of files to compile from ~2200 to ~11000.

BUG=NONE

Committed: https://crrev.com/c7d6272c3a0448ecc04f263c05c8e0bc51d5ed31
Cr-Commit-Position: refs/heads/master@{#300113}

[pneubeck (no reviews), 2014-09-24 09:38:21]

pneubeck@chromium.org changed reviewers:
+ antrim@chromium.org, satorux@chromium.org

[pneubeck (no reviews), 2014-09-24 09:38:22]

@Satoru, please take a look.

@Denis, FYI

[pneubeck (no reviews), 2014-10-17 15:04:36]

ping

[satorux1, 2014-10-17 16:06:51]

lgtm. sorry, i didn't notice.

[pneubeck (no reviews), 2014-10-17 16:07:57]

The CQ bit was checked by pneubeck@chromium.org

[commit-bot: I haz the power, 2014-10-17 16:08:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/600753002/20001

[commit-bot: I haz the power, 2014-10-17 16:13:10]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-10-17 16:13:37]

Patchset 2 (id:??) landed as
https://crrev.com/c7d6272c3a0448ecc04f263c05c8e0bc51d5ed31
Cr-Commit-Position: refs/heads/master@{#300113}