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Fix more uses of T* conversion operator from scoped_refptr<T> which is now removed.

Please see https://codereview.chromium.org/510323002 for reference.

TEST=ozone_demo and content_shell under Ozone-GBM
BUG=none
NOTRY=true

Review URL: https://codereview.chromium.org/552133004

Cr-Commit-Position: refs/heads/master@{#294172}