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C++ 11 enables containers that contain move-only type, scoped_ptr.
So, Use std::map<key, scoped_ptr<Foo>> instead of ScopedPtrMap.

BUG=554291
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1462763002

Cr-Commit-Position: refs/heads/master@{#361315}