Use DCHECK instead of <assert.h> in scoped_ptr.h.
Use DCHECK instead of <assert.h> in scoped_ptr.h.

base/logging actually re-#defines assert(), so whether or not your translation
unit winds up with the one from logging.h or <assert.h> depends on #include
order.

BUG=117803

Review URL: https://codereview.chromium.org/1729643002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#377493}

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