Revert of mac: Implement custom AppKit Enter Fullscreen transition.

Revert of mac: Implement custom AppKit Enter Fullscreen transition. (patchset #6 id:240001 of https://codereview.chromium.org/846443004/)

Reason for revert:
Trying to track down a sizes failure.  Speculatively reverting.  Will re-apply if not the cause.

Original issue's description:
> mac: Implement custom AppKit Enter Fullscreen transition.
>
> AppKit's default Fullscreen transition cross-fades between two static images: a
> snapshot of the window before the transition began, and a snapshot of the
> window resized to the full size of the screen. This has the problem that
> frequently, when AppKit takes the snapshot of the final state of the window,
> the web contents view has not yet drawn any content in the new size. The
> animation itself looks weird, and then there's a flash when the animation
> finishes where the snapshot of the old web content is replaced by the new web
> content.
>
> This custom fullscreen transition is very similar, except instead of taking a
> snapshot of the window in its final state, the transition uses a live version
> of the window in its final state. See the associated bug for more details about
> the implementation.
>
> BUG=414527
>
> Committed: https://crrev.com/a48cbbba0075b7a7c135605ab576bad2cfa5a1b3
> Cr-Commit-Position: refs/heads/master@{#311717}

TBR=andresantoso@chromium.org,rsesek@chromium.org,mark@chromium.org,erikchen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=414527, 449333
Committed: https://crrev.com/3e9e697cec99343b2e85f54a0b7a4e9932415233
Cr-Commit-Position: refs/heads/master@{#311768}

[maniscalco, 2015-01-15 23:32:46]

Created Revert of mac: Implement custom AppKit Enter Fullscreen transition.

[commit-bot: I haz the power, 2015-01-15 23:34:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/848153005/1

[commit-bot: I haz the power, 2015-01-15 23:36:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-15 23:37:31]

Patchset 1 (id:??) landed as
https://crrev.com/3e9e697cec99343b2e85f54a0b7a4e9932415233
Cr-Commit-Position: refs/heads/master@{#311768}