Revert of Mac: Fix rounded corners on browser windows on retina display.

Revert of Mac: Fix rounded corners on browser windows on retina display. (patchset #4 id:80001 of https://codereview.chromium.org/463263002/)

Reason for revert:
When the download bar is present, the rounded corners are on the wrong view.

https://code.google.com/p/chromium/issues/detail?id=412580

Original issue's description:
> Mac: Fix rounded corners on browser windows on retina display.
>
> When a window's bottom corner is covered by a layer on a retina display, the
> corner is incorrectly rounded. I added a layer mask to do the corner rounding
> ourselves.
>
> BUG=396264
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289811

TBR=andresantoso@chromium.org,ccameron@chromium.org,shess@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=396264
Committed: https://crrev.com/4e8a29255097ef8757b2bde0d8777625265355d8
Cr-Commit-Position: refs/heads/master@{#294265}

[erikchen, 2014-09-10 20:29:16]

Created Revert of Mac: Fix rounded corners on browser windows on retina display.

[Andre, 2014-09-10 20:33:14]

lgtm

[commit-bot: I haz the power, 2014-09-10 21:02:21]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/erikchen@chromium.org/560913004/1

[commit-bot: I haz the power, 2014-09-10 21:11:53]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-10 21:11:53]

Failed to apply patch for
chrome/browser/ui/cocoa/browser_window_controller_private.mm:
While running git apply --index -p1;
  error: patch failed:
chrome/browser/ui/cocoa/browser_window_controller_private.mm:523
  error: chrome/browser/ui/cocoa/browser_window_controller_private.mm: patch
does not apply

Patch:       chrome/browser/ui/cocoa/browser_window_controller_private.mm
Index: chrome/browser/ui/cocoa/browser_window_controller_private.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
index
b43e1d0b0e55485fdc4ca0d94105202d6f7e37f6..484e0271f182ebfee893a70ec79efe6e26c93ecc
100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -523,10 +523,6 @@
   }
 }
 
-- (void)updateRoundedBottomCorners {
-  [[self tabContentArea] setRoundedBottomCorners:![self isFullscreen]];
-}
-
 - (void)adjustToolbarAndBookmarkBarForCompression:(CGFloat)compression {
   CGFloat newHeight =
       [toolbarController_ desiredHeightForCompression:compression];
@@ -916,7 +912,6 @@
   [self showFullscreenExitBubbleIfNecessary];
   browser_->WindowFullscreenStateChanged();
   [[[self window] cr_windowView] setWantsLayer:NO];
-  [self updateRoundedBottomCorners];
 }
 
 - (void)windowWillExitFullScreen:(NSNotification*)notification {
@@ -931,7 +926,6 @@
   if (notification)  // For System Fullscreen when non-nil.
     [self deregisterForContentViewResizeNotifications];
   browser_->WindowFullscreenStateChanged();
-  [self updateRoundedBottomCorners];
 }
 
 - (void)windowDidFailToEnterFullScreen:(NSWindow*)window {

[erikchen, 2014-09-10 23:46:49]

Patchset #2 (id:130001) has been deleted

[erikchen, 2014-09-10 23:46:53]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2014-09-10 23:49:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/560913004/150001

[commit-bot: I haz the power, 2014-09-10 23:56:57]

Committed patchset #2 (id:150001) as ec787cead58de666c44e21e3a045d73fd6381d0f

[commit-bot: I haz the power, 2014-09-11 00:09:13]

Patchset 2 (id:??) landed as
https://crrev.com/4e8a29255097ef8757b2bde0d8777625265355d8
Cr-Commit-Position: refs/heads/master@{#294265}