Revert of Profiler-instrumentation of the startup time

Revert of Profiler-instrumentation of the startup time (patchset #2 id:20001 of https://codereview.chromium.org/866403008/)

Reason for revert:
Reverting due to https://crbug.com/454534

Original issue's description:
> Profiler-instrumentation of the startup time.
>
> Before the instrumentation, startup time wasn't reported in profiler data.
>
> Profiling it will allow the genre of detailed analysis of the startup time via jankiness investigations.
>
> This change requires temporarily initializing tracking earlier than usual. Thie will either removed once the investigations complete, or will be officially converted to permanent code.
>
> BUG=453640
>
> Committed: https://crrev.com/1ebb11710e08d51fa99836190edc3db28dffc136
> Cr-Commit-Position: refs/heads/master@{#314179}

TBR=asvitkine@chromium.org,isherman@chromium.org,cpu@chromium.org,vadimt@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=453640
Committed: https://crrev.com/08e8ca85abb7216e00ebdd957287274c8880aeba
Cr-Commit-Position: refs/heads/master@{#314204}

[oystein (OOO til 10th of July), 2015-02-02 22:38:59]

Created Revert of Profiler-instrumentation of the startup time

[commit-bot: I haz the power, 2015-02-02 22:40:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/864273003/1

[cpu_(ooo_6.6-7.5), 2015-02-02 22:41:31]

lgtm

[commit-bot: I haz the power, 2015-02-02 22:41:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-02 22:42:46]

Patchset 1 (id:??) landed as
https://crrev.com/08e8ca85abb7216e00ebdd957287274c8880aeba
Cr-Commit-Position: refs/heads/master@{#314204}