Revert of Enabled gpu_times metrics.

Revert of Enabled gpu_times metrics. (patchset #1 id:1 of https://codereview.chromium.org/937073003/)

Reason for revert:
Causing not redness.

Original issue's description:
> Enabled gpu_times metrics.
>
> The issue where gpu_times would use too much memory has been fixed:
> https://codereview.chromium.org/920523002
>
> In order to prepare for future changes where additional metrics
> will be added to the TBM module, I have also preemptively added a
> filter function which filters out values relating to gpu_times.
>
> R=nednguyen@chromium.org
> BUG=455292, 453131
> TEST=local runs measuring memory usage shows ~700mb
>
> Committed: https://crrev.com/ed5b27a7459e35248992fd5549b72b5731a8baa4
> Cr-Commit-Position: refs/heads/master@{#317974}

TBR=dyen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=455292, 453131
Committed: https://crrev.com/e917b49708a65bcf4295ee872ea2fb8e94b3bbcf
Cr-Commit-Position: refs/heads/master@{#318034}

[nednguyen, 2015-02-25 13:22:55]

Created Revert of Enabled gpu_times metrics.

[commit-bot: I haz the power, 2015-02-25 13:23:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/952133003/1

[commit-bot: I haz the power, 2015-02-25 13:23:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-25 13:24:32]

Patchset 1 (id:??) landed as
https://crrev.com/e917b49708a65bcf4295ee872ea2fb8e94b3bbcf
Cr-Commit-Position: refs/heads/master@{#318034}