Remove unused functions in PositionOptions

Remove unused functions in PositionOptions

setEnableHighAccuracy, setTimeout and setMaximumAge are only used in
"V8GeolocationCustom.cpp", but that file has been removed on the r176719.
Therefore those functinos have to be removed also.

BUG=385426
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=176744

[kihong, 2014-06-23 05:47:00]

PTAL

[haraken, 2014-06-23 06:03:03]

LGTM

[kihong, 2014-06-23 06:05:59]

The CQ bit was checked by kihong.kwon@samsung.com

[commit-bot: I haz the power, 2014-06-23 06:06:50]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/kihong.kwon@samsung.com/348253003/1

[commit-bot: I haz the power, 2014-06-23 08:31:08]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/13082)

[commit-bot: I haz the power, 2014-06-23 09:10:50]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-23 09:10:51]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/13091)

[kihong, 2014-06-23 09:59:41]

The CQ bit was checked by kihong.kwon@samsung.com

[commit-bot: I haz the power, 2014-06-23 10:00:39]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/kihong.kwon@samsung.com/348253003/1

[Michael van Ouwerkerk, 2014-06-23 10:40:59]

lgtm

[commit-bot: I haz the power, 2014-06-23 11:02:47]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/13099)

[commit-bot: I haz the power, 2014-06-23 12:22:36]

Change committed as 176744