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

Review URL: https://codereview.chromium.org/1147093008

Cr-Commit-Position: refs/heads/master@{#331669}