GitLab

View hierarchy takes the ownership of the remote view host.
Replace unique_ptr with raw pointer to avoid double-free.

BUG=925769
TEST=manually

Change-Id: Ic34a87081782d10e4ad42ecfaa9fb6127abf52cb
Reviewed-on: https://chromium-review.googlesource.com/c/1488403Reviewed-by: Mitsuru Oshima (Slow) <oshima@chromium.org>
Commit-Queue: Ryo Hashimoto <hashimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635818}