Revert of Add build targets for Opus tests.

Revert of Add build targets for Opus tests. (patchset #2 id:20001 of https://codereview.chromium.org/894473002/)

Reason for revert:
This CL breaks WebRTC in Chrome and must be reverted. Contact tlegrand@ for more details.

Original issue's description:
> Add build targets for Opus tests.
>
> test_opus_api, test_opus_encode, test_opus_decode, and test_opus_padding
> can be run directly, with no command-line options, and they print out
> "OK" during the test and an overall status message such as
> "All API tests passed." or "Tests completed successfully." at the end.
>
> The celt component has several unit tests. I didn't add build targets
> for them because some of them don't print any output, so you'd need a
> test harness script to examine their exit status.
>
> R=henrika@chromium.org,sergeyu@chromium.org
> BUG=452984
>
> Committed: https://crrev.com/8b76b75f78ffdb9760ee7eea4f149c5d2b64bc89
> Cr-Commit-Position: refs/heads/master@{#314235}

TBR=sergeyu@chromium.org,brettw@chromium.org,wtc@chromium.org, tlegrand@chromium.org
BUG=452984
Committed: https://crrev.com/870ebb78d22969468c150393e6946dab5fd95cb6
Cr-Commit-Position: refs/heads/master@{#314308}

[henrika (OOO until Aug 14), 2015-02-03 09:34:08]

Created Revert of Add build targets for Opus tests.

[henrika (OOO until Aug 14), 2015-02-03 09:34:15]

The CQ bit was unchecked by henrika@chromium.org

[henrika (OOO until Aug 14), 2015-02-03 09:37:05]

henrika@chromium.org changed reviewers:
+ tlegrand@chromium.org

[henrika (OOO until Aug 14), 2015-02-03 09:37:14]

The CQ bit was checked by henrika@chromium.org

[commit-bot: I haz the power, 2015-02-03 09:37:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/884483005/1

[commit-bot: I haz the power, 2015-02-03 10:53:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-03 10:54:39]

Patchset 1 (id:??) landed as
https://crrev.com/870ebb78d22969468c150393e6946dab5fd95cb6
Cr-Commit-Position: refs/heads/master@{#314308}