Revert of Run telemetry_perf_unittests via isolate on "Windows Tests" & "Mac tests" and trybot.

Revert of Run telemetry_perf_unittests via isolate on "Windows Tests" & "Mac tests" and trybot. (patchset #1 id:100001 of https://codereview.chromium.org/1423733003/ )

Reason for revert:
This seems to break the Mac Builder. Output is here:

https://build.chromium.org/p/chromium.mac/builders/Mac%20Builder/builds/30992

Original issue's description:
> Run telemetry_perf_unittests via isolate on "Windows Tests" & "Mac tests" and trybot.
>
> BUG=507796
>
> Committed: https://crrev.com/78fe10dde5b14fa699a8195ba050efc9c5204958
> Cr-Commit-Position: refs/heads/master@{#356573}

TBR=phajdan.jr@chromium.org,maruel@chromium.org,kbr@chromium.org,nednguyen@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=507796
Committed: https://crrev.com/8fd1011e2aa9a68766a053861c43be04fafa15ac
Cr-Commit-Position: refs/heads/master@{#356602}

[Georges Khalil, 2015-10-28 19:08:41]

Created Revert of Run telemetry_perf_unittests via isolate on "Windows Tests" &
"Mac tests" and trybot.

[commit-bot: I haz the power, 2015-10-28 19:09:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1417923005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1417923005/1

[commit-bot: I haz the power, 2015-10-28 19:10:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-28 19:11:21]

Patchset 1 (id:??) landed as
https://crrev.com/8fd1011e2aa9a68766a053861c43be04fafa15ac
Cr-Commit-Position: refs/heads/master@{#356602}