Remove some dead scrolling paths and unused params

Remove some dead scrolling paths and unused params

didScrollRect turns out to be useless as do some scroll delta params,
so I've deleted them.

Note this patch depends on: https://codereview.chromium.org/347053005

BUG=None

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=176802

[Ian Vollick, 2014-06-23 15:07:58]

https://codereview.chromium.org/348193002/diff/1/public/web/WebWidgetClient.h
File public/web/WebWidgetClient.h (left):

https://codereview.chromium.org/348193002/diff/1/public/web/WebWidgetClient.h...
public/web/WebWidgetClient.h:56: virtual void didScrollRect(int dx, int dy,
const WebRect& clipRect) { }
I'm not sure when it disappeared, but there's no def'n of didScrollRect that
actually does anything, so I started unravelling things.

[abarth-chromium, 2014-06-23 17:11:19]

LGTM

[Ian Vollick, 2014-06-23 22:13:14]

The CQ bit was checked by vollick@chromium.org

[commit-bot: I haz the power, 2014-06-23 22:13:50]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vollick@chromium.org/348193002/20001

[commit-bot: I haz the power, 2014-06-23 23:33:24]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  mac_blink_compile_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_compile_dbg/bu...)
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/12448)
  win_blink_compile_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_compile_dbg/bu...)
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/13196)
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/20522)
  win_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu/builds/24367)

[commit-bot: I haz the power, 2014-06-24 00:00:52]

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

[commit-bot: I haz the power, 2014-06-24 00:00:54]

Try jobs failed on following builders:
  mac_blink_compile_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_compile_dbg/bu...)

[Ian Vollick, 2014-06-24 00:24:15]

The CQ bit was checked by vollick@chromium.org

[commit-bot: I haz the power, 2014-06-24 00:24:27]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vollick@chromium.org/348193002/40001

[commit-bot: I haz the power, 2014-06-24 01:26:50]

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/13206)

[commit-bot: I haz the power, 2014-06-24 02:03:06]

Change committed as 176802