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Right now, AwContents has a member |functor_|. This is never read. It is
only written in the function it is being consumed in.

This CL simplifies AwContents by removing the |functor_| member and
consuming the parameter in SetAwGLFunctor().

Change-Id: Ib40ee7d7e198b656e2f8b9011996b6d0550596bf
Reviewed-on: https://chromium-review.googlesource.com/c/1352414Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Chris Blume <cblume@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611458}