Mac: Update sheet position when bookmark bar is shown or hidden.

Mac: Update sheet position when bookmark bar is shown or hidden.

In r272421, I changed sheet repositioning on window resize to be based on
NSWindowDidResizeNotification instead of NSViewFrameDidChangeNotification
because it tracks window resizing much more smoothly.

That caused this problem where if the browser window is vertically maximized
(or is in fullscreen), the window size does not change when the bookmark bar
is shown or hidden.

The old code has a different bug however. If the browser window is not
vertically maximized, showing or hiding the bookmark bar does not change the
browser content view's frame. It moves up or down to follow the window resize
but its frame relative to its superview remains the same.

I settled for adding code to explicitly update the sheet's position when the
bookmark bar is shown or hidden.

BUG=407509
Committed: https://crrev.com/5648b809d1c50e3de754b96abe7cf2b60150ff4d
Cr-Commit-Position: refs/heads/master@{#292421}

[Andre, 2014-08-27 01:07:54]

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

[Andre, 2014-08-28 05:20:58]

Avi, can you review?

[Avi (use Gerrit), 2014-08-28 15:07:12]

lgtm

Sure. Simple and effective.

[Andre, 2014-08-28 16:17:31]

The CQ bit was checked by andresantoso@chromium.org

[commit-bot: I haz the power, 2014-08-28 16:18:19]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/andresantoso@chromium.org/502413004/1

[commit-bot: I haz the power, 2014-08-28 18:30:01]

Committed patchset #1 (id:1) as dbcac30e9a43abba78b2e9ea96d1ae4694746e42

[commit-bot: I haz the power, 2014-09-10 03:00:50]

Patchset 1 (id:??) landed as
https://crrev.com/5648b809d1c50e3de754b96abe7cf2b60150ff4d
Cr-Commit-Position: refs/heads/master@{#292421}

[Andre, 2014-10-13 22:04:01]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/653733002/ by andresantoso@chromium.org.

The reason for reverting is: Broke certificate info positioning when switching
tabs (http://crbug.com/419371).
I will need to come up with a better fix for this, but it looks complicated and
that bug is a M39 stable blocker so reverting this first.
.