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The discussion around Rvalue references has been that we should ban
their use for now, but come back to it later. So that is what this
does.

One exceptional case that was agreed upon without dissent was to allow
move semantics in scoped_ptr to allow use of scoped_ptr cleaner
throughout the codebase, without leaking the requirement to understand
Rvalue references outside of the scoped_ptr implementation.

R=jamesr@chromium.org, thakis@chromium.org

Review URL: https://codereview.chromium.org/607773002

Cr-Commit-Position: refs/heads/master@{#297016}