Reland of Clean up some NativeTheme code.

Reland of Clean up some NativeTheme code. (patchset #1 id:1 of https://codereview.chromium.org/2484973003/ )

Reason for revert:
wrong CL reverted

Original issue's description:
> Revert of Clean up some NativeTheme code. (patchset #1 id:1 of https://codereview.chromium.org/2485013002/ )
>
> Reason for revert:
> Apparently CQ landed this CL twice. Tried reverting it once to see what happens.
>
> Original issue's description:
> > Reland of Clean up some NativeTheme code.
> >  ( https://codereview.chromium.org/2480993002/ )
> >
> > Now with appropriate use of break in switch statement.
> >
> > Original issue's description:
> > > Clean up some NativeTheme code.
> > >
> > > - improve instantiation
> > > - allow to specify separate instances for web and native
> > > - two NativeThemeAura instances coexist for w/wo overlay scrollbars
> > >
> > > BUG=307091
> >
> > Committed: https://crrev.com/93ed99a0238f25fe391874d3f6dfa02c01acb781
> > Cr-Commit-Position: refs/heads/master@{#430608}
>
> TBR=bokan@chromium.org,sky@chromium.org,estade@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://crrev.com/16a00aca0642af4f75ed4c68f662e68f590c6cef
> Cr-Commit-Position: refs/heads/master@{#430610}

TBR=bokan@chromium.org,sky@chromium.org,xlai@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/fb1357c76c573cb25d22c19123df3795ff45c46f
Cr-Commit-Position: refs/heads/master@{#430611}

[Evan Stade, 2016-11-08 14:56:35]

The CQ bit was checked by estade@chromium.org

[Evan Stade, 2016-11-08 14:56:36]

Created Reland of Clean up some NativeTheme code.

[commit-bot: I haz the power, 2016-11-08 14:57:02]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-08 14:58:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-08 15:01:01]

Description was changed from

==========
Reland of Clean up some NativeTheme code. (patchset #1 id:1 of
https://codereview.chromium.org/2484973003/ )

Reason for revert:
wrong CL reverted

Original issue's description:
> Revert of Clean up some NativeTheme code. (patchset #1 id:1 of
https://codereview.chromium.org/2485013002/ )
> 
> Reason for revert:
> Apparently CQ landed this CL twice. Tried reverting it once to see what
happens.
> 
> Original issue's description:
> > Reland of Clean up some NativeTheme code.
> >  ( https://codereview.chromium.org/2480993002/ )
> >
> > Now with appropriate use of break in switch statement.
> >
> > Original issue's description:
> > > Clean up some NativeTheme code.
> > >
> > > - improve instantiation
> > > - allow to specify separate instances for web and native
> > > - two NativeThemeAura instances coexist for w/wo overlay scrollbars
> > >
> > > BUG=307091
> >
> > Committed: https://crrev.com/93ed99a0238f25fe391874d3f6dfa02c01acb781
> > Cr-Commit-Position: refs/heads/master@{#430608}
> 
> TBR=bokan@chromium.org,sky@chromium.org,estade@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> 
> Committed: https://crrev.com/16a00aca0642af4f75ed4c68f662e68f590c6cef
> Cr-Commit-Position: refs/heads/master@{#430610}

TBR=bokan@chromium.org,sky@chromium.org,xlai@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Reland of Clean up some NativeTheme code. (patchset #1 id:1 of
https://codereview.chromium.org/2484973003/ )

Reason for revert:
wrong CL reverted

Original issue's description:
> Revert of Clean up some NativeTheme code. (patchset #1 id:1 of
https://codereview.chromium.org/2485013002/ )
>
> Reason for revert:
> Apparently CQ landed this CL twice. Tried reverting it once to see what
happens.
>
> Original issue's description:
> > Reland of Clean up some NativeTheme code.
> >  ( https://codereview.chromium.org/2480993002/ )
> >
> > Now with appropriate use of break in switch statement.
> >
> > Original issue's description:
> > > Clean up some NativeTheme code.
> > >
> > > - improve instantiation
> > > - allow to specify separate instances for web and native
> > > - two NativeThemeAura instances coexist for w/wo overlay scrollbars
> > >
> > > BUG=307091
> >
> > Committed: https://crrev.com/93ed99a0238f25fe391874d3f6dfa02c01acb781
> > Cr-Commit-Position: refs/heads/master@{#430608}
>
> TBR=bokan@chromium.org,sky@chromium.org,estade@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://crrev.com/16a00aca0642af4f75ed4c68f662e68f590c6cef
> Cr-Commit-Position: refs/heads/master@{#430610}

TBR=bokan@chromium.org,sky@chromium.org,xlai@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/fb1357c76c573cb25d22c19123df3795ff45c46f
Cr-Commit-Position: refs/heads/master@{#430611}
==========

[commit-bot: I haz the power, 2016-11-08 15:01:02]

Patchset 1 (id:??) landed as
https://crrev.com/fb1357c76c573cb25d22c19123df3795ff45c46f
Cr-Commit-Position: refs/heads/master@{#430611}