Revert of Make sure that tracing is always cleaned up for v8_gc_times page_test

Revert of Make sure that tracing is always cleaned up for v8_gc_times page_test (patchset #4 id:60001 of https://codereview.chromium.org/1151933005/)

Reason for revert:
I suspect this is causing failures on telemetry_perf_unittests - see https://build.chromium.org/p/chromium.win/builders/XP%20Tests%20%281%29 build #37836 and later

Original issue's description:
> Make sure that tracing is always cleaned up for v8_gc_times page_test
>
> BUG=491104
> CQ_EXTRA_TRYBOTS=tryserver.chromium.perf:linux_perf_bisect;tryserver.chromium.perf:mac_perf_bisect;tryserver.chromium.perf:win_perf_bisect;tryserver.chromium.perf:android_nexus5_perf_bisect
>
> Committed: https://crrev.com/1d1d10c687de9424db5a66a89d179f11784d7ee8
> Cr-Commit-Position: refs/heads/master@{#331590}

TBR=sullivan@chromium.org,rmcilroy@chromium.org,prasadv@chromium.org,nednguyen@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=491104
Committed: https://crrev.com/fb9823b0bd5819345dcb105740e765e34f2e09f8
Cr-Commit-Position: refs/heads/master@{#331669}

[samuong, 2015-05-27 22:10:57]

Created Revert of Make sure that tracing is always cleaned up for v8_gc_times
page_test

[commit-bot: I haz the power, 2015-05-27 22:12:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1147093008/1

[commit-bot: I haz the power, 2015-05-27 22:13:58]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-27 22:14:41]

Patchset 1 (id:??) landed as
https://crrev.com/fb9823b0bd5819345dcb105740e765e34f2e09f8
Cr-Commit-Position: refs/heads/master@{#331669}