Remove code rendered pointless by r65322.

Since r65322 MessagePump::ScheduleDelayedWork, which is the underlying
implementation for PostDelayedTask, operates on TimeTicks instead of Time
units. The TimeTicks timebase is stopped during system sleep. Consequently,
since that revision, any work that is scheduled through this interface is now
expected to be dispatched after a period of TimeTicks, meaning that it will be
further delayed by system sleep.

MessagePumpCFRunLoopBase::PowerStateNotification had been used to force an
attempt to process queued delayed work upon system wakeup. This had the result
of dispatching any work whose expected fire time had occurred while the system
was asleep, if any, and of resetting the CFRunLoopTimer properly following a
change in the offset between the two timebases. Since r65322, there is only
a single timebase and no offset, so PowerStateNotification's dispatch attempt
was pointless and would never result in delayed work being dispatched or the
CFRunLoopTimer being reset to fire at a time other than what it had already
been to fire at.

IORegisterForSystemPower may be blocked by the sandbox in some processes on
some OS releases, and its use in such circumstances might result in messages
about its failure being logged. Since this code no longer has any effect,
it can be dropped without perceptible impact, and these alleged log messages
will allegedly disappear.

BUG=74055
TEST=FutureCat Console.app
     Also run the tests from http://codereview.chromium.org/342011. The
     behavior post-r65322 may have changed from the expectations listed in
     that change, but the behavior should not change at all between the
     post-r65322 code and this change.
Review URL: http://codereview.chromium.org/6831009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@81597 0039d316-1c4b-4281-b951-d872f2087c98

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