Dan Albert b0624da118 Use std::unique_ptr instead of UniquePtr.
We're deprecating UniquePtr, so we need to move to the real thing.

Bug: http://b/22403888
Change-Id: I5b7fdf4924dd8c12a8c7dba89278714ca6fdc60a
2015-11-05 00:57:12 -08:00
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