Fix remaining incompatibilities between scoped_ptr and unique_ptr.
scoped_ptr is more convertible to bool than std::unique_ptr.
bool x = scoped_ptr<int>(); // compiles
bool y = std::unique_ptr<int>(); // explodes
std::unique_ptr is not streamable:
LOG(ERROR) << scoped_ptr<int>(); // compiles
LOG(ERROR) << std::unique_ptr<int>(); // explodes
BUG=579269,579270
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
Review URL: https://codereview.chromium.org/1609923002
Cr-Commit-Position: refs/heads/master@{#370266}
60 files changed
