Remove raw base::DictionaryValue::Set in //chrome

This change removes the deprecated raw pointer version of
base::DictionaryValue::Set in //chrome and replaces it with the unique
pointer version or other convenience functions where appropriate.

BUG=646113, 581865

Review-Url: https://codereview.chromium.org/2888073002
Cr-Commit-Position: refs/heads/master@{#472473}
44 files changed