Remove setMainFrameScrollOffset method from WebViewImpl.

Remove setMainFrameScrollOffset method from WebViewImpl.

Whoops, forgot to remove the declaration in r196421

BUG=
TBR=skobes@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=196503

[bokan, 2015-06-03 21:18:32]

TBR'ing since the change was LGTM'd in the noted revision.

[bokan, 2015-06-03 21:18:34]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2015-06-03 21:20:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1148263006/1

[commit-bot: I haz the power, 2015-06-03 22:22:00]

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

[commit-bot: I haz the power, 2015-06-03 22:22:00]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/65133)

[bokan, 2015-06-03 22:33:28]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2015-06-03 22:33:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1148263006/1

[commit-bot: I haz the power, 2015-06-03 23:17:43]

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

[commit-bot: I haz the power, 2015-06-03 23:17:44]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/65146)

[bokan, 2015-06-04 10:43:34]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2015-06-04 10:43:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1148263006/1

[commit-bot: I haz the power, 2015-06-04 14:04:04]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=196503