Even less moving from unique_ptr

Even less moving from unique_ptr

clang-3.7 warns that these std::move calls prevent the copy-elision
optimization that is permitted for returns of named values. Now that
these pointers are always std::unique_ptr, we have no need of the
std::move anyway.

I missed these in an earlier patch, through not building the test
binaries when I checked clang-3.7.

Change-Id: I7b7518564a02c98117c7c7e92dcc7f8d12b7a245