Remove implicit conversions from scoped_refptr to T* in PasswordStoreMac test.

- Add a .get() to a boolean test until boolean tests on scoped_refptr
  can be re-enabled.
- Change the test fixture store() accessor to just return a raw pointer,
  since no one depends on it returning a scoped_refptr anyway.

BUG=110610
TBR=stuartmorgan@chromium.org

Review URL: https://codereview.chromium.org/584373002

Cr-Commit-Position: refs/heads/master@{#295873}
1 file changed