Make workaround for std::unique_ptr<const T[]> bug in old libstdc++ work.

BUG=skia:

Change-Id: I58a07d4ce35bdd03e7edcf50e88d9982b3885546
Reviewed-on: https://skia-review.googlesource.com/8101
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2 files changed