[index] Fix methods that take a shared_ptr to just take a reference.

There is no ownership here, passing a shared_ptr just adds confusion. No
functionality change intended.


git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@330595 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed