Add additional move support to ScopedGeneric in the form of operator=.

This also removes the C++03 emulated move support and uses full C++11 move semantics.

BUG=453142
R=danakj@chromium.org

Review URL: https://codereview.chromium.org/995093002

Cr-Commit-Position: refs/heads/master@{#319990}
2 files changed