Add includes back to channel_info.h.
Add includes back to channel_info.h.

(They were removed in ea8e9591f3d0e9a0240b54db3cb7b3446dd0e444.)

MSVS doesn't like not having them, at least sometimes. I'm not sure why.

TBR=yzshen@chromium.org

Review URL: https://codereview.chromium.org/908973002

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