Revert of Standardize "gpu_times" metric names and add GPU rasterization versions.

Revert of Standardize "gpu_times" metric names and add GPU rasterization versions. (patchset #2 id:20001 of https://codereview.chromium.org/875473003/)

Reason for revert:
Speculative revert for crbug.com/453131

Original issue's description:
> Standardize "gpu_times" metric names and add GPU rasterization versions.
>
> The GPU Times metric event names have been standardized to match the
> names for other metrics. GPU Rasterization versions have also been
> added for both GPU times tests. Here is the list of test names:
>   gpu_times.gpu_rasterization.key_mobile_sites_smooth
>   gpu_times.gpu_rasterization.top_25_smooth
>   gpu_times.key_mobile_sites_smooth
>   gpu_times.top_25_smooth
>
> R=vmiura@chromium.org
> BUG=none
> test=trybots
>
> Committed: https://crrev.com/9fbe73b4158beb6beb278af819e075cc3d744210
> Cr-Commit-Position: refs/heads/master@{#313825}

TBR=vmiura@chromium.org,epenner@chromium.org,dyen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=none

Committed: https://crrev.com/92a5662c9732fb41f2afc2026ed0e6b4e9c1fcd3
Cr-Commit-Position: refs/heads/master@{#314192}

[oystein (OOO til 10th of July), 2015-02-02 21:34:03]

Created Revert of Standardize "gpu_times" metric names and add GPU rasterization
versions.

[commit-bot: I haz the power, 2015-02-02 21:34:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/896593002/1

[commit-bot: I haz the power, 2015-02-02 21:36:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-02 21:37:24]

Patchset 1 (id:??) landed as
https://crrev.com/92a5662c9732fb41f2afc2026ed0e6b4e9c1fcd3
Cr-Commit-Position: refs/heads/master@{#314192}

[oystein (OOO til 10th of July), 2015-02-03 00:29:47]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/898593004/ by oysteine@chromium.org.

The reason for reverting is: Reverting the revert; looks like this wasn't the
culprit..