Make scoped_array<T> more compatible with scoped_ptr<T[]>.

Make scoped_array<T> more compatible with scoped_ptr<T[]>.

The eventual plan is to replace scoped_array<T> with scoped_ptr<T[]>.
All existing issues with these new restrictions have been fixed, so I'd
like to enforce them for scoped_array while the transition is still in
progress.

BUG=171118
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=192528

[dcheng, 2013-04-04 23:05:24]

I thought I already disabled this for scoped_array<T>, but it turns out I forgot
and only did it for scoped_ptr<T[]>

[darin (slow to review), 2013-04-05 06:22:35]

LGTM

[dcheng, 2013-04-05 07:57:17]

Committed patchset #2 manually as r192528 (presubmit successful).