MacViews: Fix GN build

MacViews: Fix GN build

build/config/BUILDCONFIG.gn explicitly disallows wildcards for things
like toolkits, so move _aura* files into aura_sources variables (which
mostly already existed).

gfx/BUILD.gn needed an update to the condition for nine_image_painter.cc,
to be consistent with gfx.gyp.

BUG=363529
Committed: https://crrev.com/603d6756583bece8e4ae8d9e8bbb43b5a8d16c07
Cr-Commit-Position: refs/heads/master@{#321144}

[tapted, 2015-03-18 07:01:43]

tapted@chromium.org changed reviewers:
+ sky@chromium.org

[tapted, 2015-03-18 07:07:13]

tapted@chromium.org changed reviewers:
- sky@chromium.org

[tapted, 2015-03-18 07:19:54]

tapted@chromium.org changed reviewers:
+ sky@chromium.org

[tapted, 2015-03-18 08:31:16]

Hi sky, please take a look. .. turns out GN on Mac is further along than when I
last checked on it.

[sky, 2015-03-18 15:01:58]

LGTM

[Andre, 2015-03-18 15:53:38]

The CQ bit was checked by andresantoso@chromium.org

[commit-bot: I haz the power, 2015-03-18 15:58:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1011323003/20001

[commit-bot: I haz the power, 2015-03-18 16:06:06]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-03-18 16:06:40]

Patchset 2 (id:??) landed as
https://crrev.com/603d6756583bece8e4ae8d9e8bbb43b5a8d16c07
Cr-Commit-Position: refs/heads/master@{#321144}