Revert of Initialize the now_funciton to the HighResNowWrapper in case High Res is supported

Revert of Initialize the now_funciton to the HighResNowWrapper in case High Res is supported (patchset #7 of https://codereview.chromium.org/446203002/)

Reason for revert:
It causes a Canary crash

https://code.google.com/p/chromium/issues/detail?id=408354

The added static initializer causes a crash in libpeerconnetion used by WebRTC

Fix to reland: remove static initializer.

Original issue's description:
> We have noticed a clock shift when QPC was deployed. It shows as a regression on the perf bots 
> https://chromeperf.appspot.com/report?masters=ChromiumPerf&bots=chromium-rel-win8-dual&tests=startup.warm.dirty.blank_page%2Fwindow_display_time&rev=286928
> 
> It is not a real regression, the initial_time and initial_ticks are not properly initialized when switching to HighResolution (i.e. QPC).
> This CL initializes the now_function to the HighResNowWrapper instead of setting it to RolloverProtectedNow then to the HighResNowWrapper.
> 
> By doing that, we avoid getting an incorrect initial_time and initial_ticks using the RolloverProtectedNow and avoid having to reinitialize.
> 
> BUG=158234
> 
> Committed: https://chromium.googlesource.com/chromium/src/+/10c40c221c314e41add0a5b4df1ee7467681a430

TBR=jar@chromium.org,willchan@chromium.org,maruel@chromium.org,thakis@chromium.org,jam@chromium.org,cpu@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=158234
Committed: https://crrev.com/3a38fb5efd526a2278ab3b577c8c7881a3ad4d20
Cr-Commit-Position: refs/heads/master@{#292288}

[fmeawad, 2014-08-28 00:00:45]

Created Revert of Initialize the now_funciton to the HighResNowWrapper in case
High Res is supported

[commit-bot: I haz the power, 2014-08-28 00:07:52]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/fmeawad@chromium.org/516693002/1

[commit-bot: I haz the power, 2014-08-28 00:48:28]

Committed patchset #1 (id:1) as 9705ba25791c57e3a8a4cd7ddf114b27804ec01d

[commit-bot: I haz the power, 2014-09-10 02:56:19]

Patchset 1 (id:??) landed as
https://crrev.com/3a38fb5efd526a2278ab3b577c8c7881a3ad4d20
Cr-Commit-Position: refs/heads/master@{#292288}