Revert of Make ScrollbarThemeAura selectively invalidate scrollbar parts.

Revert of Make ScrollbarThemeAura selectively invalidate scrollbar parts. (patchset #10 id:180001 of https://codereview.chromium.org/1525803002/ )

Reason for revert:
Oilpan unit test failure: http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac%20Oilpan/builds/28217

Original issue's description:
> Make ScrollbarThemeAura selectively invalidate scrollbar parts.
>
> In particular:
> - when hovering or pressing the thumb, repaint only the thumb
> - when thumb position changes, repaint the track only if it changes
>   (e.g. due to a button being disabled upon reaching the end)
>
> BUG=549277
>
> Committed: https://crrev.com/0e8396ada46f085c23343450d850d81751053c94
> Cr-Commit-Position: refs/heads/master@{#367082}

TBR=ccameron@chromium.org,skobes@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=549277
Committed: https://crrev.com/55904fbf48eba4730c1de0fe9e38e89942b2c8c7
Cr-Commit-Position: refs/heads/master@{#367096}

[jbroman, 2015-12-29 20:00:43]

Created Revert of Make ScrollbarThemeAura selectively invalidate scrollbar
parts.

[commit-bot: I haz the power, 2015-12-29 20:00:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1550983002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1550983002/1

[commit-bot: I haz the power, 2015-12-29 20:03:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1550983002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1550983002/1

[jbroman, 2015-12-29 20:04:20]

jbroman@chromium.org changed reviewers:
+ japhet@chromium.org

[commit-bot: I haz the power, 2015-12-29 20:04:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-29 20:05:11]

Description was changed from

==========
Revert of Make ScrollbarThemeAura selectively invalidate scrollbar parts.
(patchset #10 id:180001 of https://codereview.chromium.org/1525803002/ )

Reason for revert:
Oilpan unit test failure:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac%20Oilpan/bu...

Original issue's description:
> Make ScrollbarThemeAura selectively invalidate scrollbar parts.
> 
> In particular:
> - when hovering or pressing the thumb, repaint only the thumb
> - when thumb position changes, repaint the track only if it changes
>   (e.g. due to a button being disabled upon reaching the end)
> 
> BUG=549277
> 
> Committed: https://crrev.com/0e8396ada46f085c23343450d850d81751053c94
> Cr-Commit-Position: refs/heads/master@{#367082}

TBR=ccameron@chromium.org,skobes@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=549277
==========

to

==========
Revert of Make ScrollbarThemeAura selectively invalidate scrollbar parts.
(patchset #10 id:180001 of https://codereview.chromium.org/1525803002/ )

Reason for revert:
Oilpan unit test failure:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac%20Oilpan/bu...

Original issue's description:
> Make ScrollbarThemeAura selectively invalidate scrollbar parts.
>
> In particular:
> - when hovering or pressing the thumb, repaint only the thumb
> - when thumb position changes, repaint the track only if it changes
>   (e.g. due to a button being disabled upon reaching the end)
>
> BUG=549277
>
> Committed: https://crrev.com/0e8396ada46f085c23343450d850d81751053c94
> Cr-Commit-Position: refs/heads/master@{#367082}

TBR=ccameron@chromium.org,skobes@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=549277

Committed: https://crrev.com/55904fbf48eba4730c1de0fe9e38e89942b2c8c7
Cr-Commit-Position: refs/heads/master@{#367096}
==========

[commit-bot: I haz the power, 2015-12-29 20:05:12]

Patchset 1 (id:??) landed as
https://crrev.com/55904fbf48eba4730c1de0fe9e38e89942b2c8c7
Cr-Commit-Position: refs/heads/master@{#367096}