Revert of Revert of Mojo: Convert scoped_ptr<...>() to nullptr in mojo/embedder. (patchset #1 id:1 of https://codereview.chromium.org/593313006/)

Reason for revert:
scoped_ptr nullptr support was un-reverted.

Original issue's description:
> Revert of Mojo: Convert scoped_ptr<...>() to nullptr in mojo/embedder. (patchset #1 id:1 of https://codereview.chromium.org/606143003/)
>
> Reason for revert:
> scoped_ptr nullptr support was reverted.
>
> Original issue's description:
> > Mojo: Convert scoped_ptr<...>() to nullptr in mojo/embedder.
> >
> > R=jamesr@chromium.org
> >
> > Committed: https://crrev.com/1b198fa11edbe68701e12c27d5f4981398f5ca71
> > Cr-Commit-Position: refs/heads/master@{#297093}
>
> TBR=jamesr@chromium.org,viettrungluu@chromium.org
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://crrev.com/76577a68922585f5621db8c63ba2ab6d5aa03f69
> Cr-Commit-Position: refs/heads/master@{#297109}

TBR=jamesr@chromium.org,dcheng@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/612923002

Cr-Commit-Position: refs/heads/master@{#297191}


CrOS-Libchrome-Original-Commit: b6a9b4d4355f50b44b8f400c7caf19ef2dca4f61
2 files changed
tree: 670c88f0e51f9660bc6d5b5813c6bd5e9d0dbf92
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/