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base::CheckedPtr<T> should behave as if it's a raw pointer.
When an implicit conversion from U* to T* is allowed, similarly
an implicit conversion from CheckedPtr<U> to CheckedPtr<T>
should be allowed, too.  This patch supports such an upcast of
CheckedPtr<T>.

Bug: 1073933
Change-Id: I0b93c95f44cf27849a96ea14c2025fd3f4a5b7e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303409Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790796}