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Turns ContentVideoView/ContentVideoViewEmbedder public interfaces,
and removes the corresponding DEPS exceptions.

Bug: 617324
Change-Id: I2e1fdd5b48e6a11e204c3d145458a58561dc0fb8
Reviewed-on: https://chromium-review.googlesource.com/1043305Reviewed-by: Stephen Lanham <slan@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557722}