ui/views: Cleanup usage of scoped_ptr.

ui/views: Cleanup usage of scoped_ptr.

* Return nullptr whenever possible.
* Use make_scoped_ptr() when possible (less typing/noise).

Entries found with the following command line:

$ git grep -E '(=|\breturn)\s*scoped_ptr<.*?>([^)]+)' ui/views

BUG=None
R=sky@chromium.org

Committed: https://crrev.com/c999097cef4e2ae05ed554bbc4b85d64928c992d
Cr-Commit-Position: refs/heads/master@{#310603}

[tfarina, 2014-12-20 18:49:36]

PTAL

[sky, 2015-01-05 17:45:05]

LGTM with the extra .Pass()s removed.

https://codereview.chromium.org/809903005/diff/1/ui/views/painter.cc
File ui/views/painter.cc (right):

https://codereview.chromium.org/809903005/diff/1/ui/views/painter.cc#newcode275
ui/views/painter.cc:275: return make_scoped_ptr(new
DashedFocusPainter(gfx::Insets())).Pass();
No .Pass() in these three.

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
File ui/views/widget/desktop_aura/desktop_cursor_loader_updater_auralinux.cc
(right):

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
ui/views/widget/desktop_aura/desktop_cursor_loader_updater_auralinux.cc:69:
return make_scoped_ptr(new DesktopCursorLoaderUpdaterAuraLinux).Pass();
no .Pass().

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
File ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc (right):

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc:180: return
make_scoped_ptr(drag_drop_client_).Pass();
no .Pass().

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
File ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc (right):

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc:298: return
make_scoped_ptr(drag_drop_client_).Pass();
no .Pass()

[tfarina, 2015-01-08 20:43:27]

https://codereview.chromium.org/809903005/diff/1/ui/views/painter.cc
File ui/views/painter.cc (right):

https://codereview.chromium.org/809903005/diff/1/ui/views/painter.cc#newcode275
ui/views/painter.cc:275: return make_scoped_ptr(new
DashedFocusPainter(gfx::Insets())).Pass();
On 2015/01/05 17:45:04, sky wrote:
> No .Pass() in these three.

Done.

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
File ui/views/widget/desktop_aura/desktop_cursor_loader_updater_auralinux.cc
(right):

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
ui/views/widget/desktop_aura/desktop_cursor_loader_updater_auralinux.cc:69:
return make_scoped_ptr(new DesktopCursorLoaderUpdaterAuraLinux).Pass();
On 2015/01/05 17:45:04, sky wrote:
> no .Pass().

Done.

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
File ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc (right):

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc:180: return
make_scoped_ptr(drag_drop_client_).Pass();
On 2015/01/05 17:45:04, sky wrote:
> no .Pass().

Done.

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
File ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc (right):

https://codereview.chromium.org/809903005/diff/1/ui/views/widget/desktop_aura...
ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc:298: return
make_scoped_ptr(drag_drop_client_).Pass();
On 2015/01/05 17:45:05, sky wrote:
> no .Pass()

Done.

[tfarina, 2015-01-08 20:43:40]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-01-08 20:45:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/809903005/20001

[commit-bot: I haz the power, 2015-01-08 21:35:03]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-01-08 21:35:51]

Patchset 2 (id:??) landed as
https://crrev.com/c999097cef4e2ae05ed554bbc4b85d64928c992d
Cr-Commit-Position: refs/heads/master@{#310603}