Remove remaining implicit scoped_ptr<T> to T* conversions in win8

Remove remaining implicit scoped_ptr<T> to T* conversions in win8

GetArgumentsFromShortcut() introduced a new implicit conversion
since the last time the clang tool was run.
The other fix in MetroViewerProcessHost simply changes the
TaskRunner pointer to be passed as a scoped_refptr<T>, since it
takes a ref to the TaskRunner.

BUG=110610
Committed: https://crrev.com/90590193a9c5b5bc674f1c7680761306ed42c1f1
Cr-Commit-Position: refs/heads/master@{#305511}

[dcheng, 2014-11-24 18:12:59]

dcheng@chromium.org changed reviewers:
+ grt@chromium.org

[grt (UTC plus 2), 2014-11-24 21:41:43]

The CQ bit was checked by grt@chromium.org

[grt (UTC plus 2), 2014-11-24 21:41:43]

lgtm

[commit-bot: I haz the power, 2014-11-24 21:43:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/753743003/1

[commit-bot: I haz the power, 2014-11-24 22:59:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-24 22:59:59]

Patchset 1 (id:??) landed as
https://crrev.com/90590193a9c5b5bc674f1c7680761306ed42c1f1
Cr-Commit-Position: refs/heads/master@{#305511}