More fixes for scoped_refptr operator T* removal.

Fix a couple more dependencies on implicit conversions that have been
checked in since this morning.

BUG=110610
R=vtl@google.com
TBR=rsleevi, vtl, yzshen

Review URL: https://codereview.chromium.org/541243003

Cr-Commit-Position: refs/heads/master@{#293458}
3 files changed