[OSX] Revert deferred-window change for FramedBrowserWindow.

[OSX] Revert deferred-window change for FramedBrowserWindow.

The change from defer:YES to defer:NO appears to have caused a perf
regression in startup.warm.blank_page .  My best hypothesis is that
Chromium doesn't provide all info at creation time, instead it sets size
and contents and the like piecemeal.  With defer:YES, these things
short-circuit operations which need to touch the backing store, while
with defer:NO they actually make changes.

This reverts part of:
https://chromium.googlesource.com/chromium/src/+/fa89814df86cd44a

BUG=496116
Committed: https://crrev.com/a1b62c42ab4a27a50107b0abdacb0d4b18b0b6a2
Cr-Commit-Position: refs/heads/master@{#333218}

[Scott Hess - ex-Googler, 2015-06-05 22:22:58]

shess@chromium.org changed reviewers:
+ avi@chromium.org

[Scott Hess - ex-Googler, 2015-06-05 22:23:32]

WRT my follow-up comment on:
  https://codereview.chromium.org/1154013009

[Avi (use Gerrit), 2015-06-06 05:52:14]

lgtm

Whatevs.

[Scott Hess - ex-Googler, 2015-06-06 18:16:03]

The CQ bit was checked by shess@chromium.org

[commit-bot: I haz the power, 2015-06-06 18:16:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1152943004/1

[commit-bot: I haz the power, 2015-06-06 18:40:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-06 18:40:57]

Patchset 1 (id:??) landed as
https://crrev.com/a1b62c42ab4a27a50107b0abdacb0d4b18b0b6a2
Cr-Commit-Position: refs/heads/master@{#333218}