Remove RenderLayerFilterInfo::m_dirtySourceRect

Remove RenderLayerFilterInfo::m_dirtySourceRect

m_dirtySourceRect is duplicating the paint invalidation logic
by storing the exact same information.

On top of that, FilterEffectRendererHelper::prepareFilterEffect
already gets the invalidation rect from |dirtyRect|.

This change is covered by css3/filters/filter-repaint-*.html
that were added with m_dirtySourceRect in
https://bugs.webkit.org/show_bug.cgi?id=80323.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180107

[dsinclair, 2014-08-12 16:31:07]

lgtm

[Xianzhu, 2014-08-12 17:28:11]

lgtm

[leviw_travelin_and_unemployed, 2014-08-12 18:03:54]

LGTM.

[Julien - ping for review, 2014-08-12 18:06:24]

The CQ bit was checked by jchaffraix@chromium.org

[commit-bot: I haz the power, 2014-08-12 18:07:45]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jchaffraix@chromium.org/453033005/20001

[commit-bot: I haz the power, 2014-08-12 18:34:39]

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/22331)

[commit-bot: I haz the power, 2014-08-12 19:04:40]

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

[commit-bot: I haz the power, 2014-08-12 19:04:41]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/22337)

[Julien - ping for review, 2014-08-12 21:32:16]

The CQ bit was checked by jchaffraix@chromium.org

[commit-bot: I haz the power, 2014-08-12 21:34:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jchaffraix@chromium.org/453033005/20001

[commit-bot: I haz the power, 2014-08-12 22:13:49]

Change committed as 180107