mac, fullscreen: Major refactor.

mac: Major fullscreen refactor.

This CL is the combination of https://codereview.chromium.org/493143004/ and
https://codereview.chromium.org/523723002/. They were reviewed separately to
make the review process easier.

Full a more detailed explanation of the refactor, see http://crbug.com/406656

Bugs fixed:
- Attempting to fullscreen HTML5 content with --enable-simplified-fullscreen
caused UI problems.
- Omnibox/toolbar did not slide in Canonical Fullscreen.
- Presentation Mode and Canonical Fullscreen tab strip layout is incorrect when
menubar is hidden.
- Canonical Fullscreen should ignore the mouse tracking area.

Refactor mostly consisted of:
- Deleted FullscreenModeController.
- External (outside of BWC) invocations of fullscreen mode are much simpler.
- Significant code reduction and logic simplification in BWC.

BUG=406656, 405561
TBR=rsesek

Committed: https://crrev.com/cfca18fc3711760d3b1bcb50d0a3475509111126
Cr-Commit-Position: refs/heads/master@{#293238}

[erikchen, 2014-09-03 21:00:32]

Patchset #1 (id:1) has been deleted

[erikchen, 2014-09-03 21:01:21]

erikchen@chromium.org changed reviewers:
+ rsesek@chromium.org

[erikchen, 2014-09-03 21:01:42]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2014-09-03 21:21:28]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/erikchen@chromium.org/533383002/40001

[commit-bot: I haz the power, 2014-09-04 00:35:23]

Committed patchset #2 (id:40001) as 3a15eeac9bd620d5e0246fbc5d896bb5fcdea9c2

[commit-bot: I haz the power, 2014-09-10 03:29:05]

Patchset 2 (id:??) landed as
https://crrev.com/cfca18fc3711760d3b1bcb50d0a3475509111126
Cr-Commit-Position: refs/heads/master@{#293238}