Mac: Fix a recently introduced layering bug.

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 700739e711e5f3cb4693ec7f7dc1b77bafe0c869..588837e8821f471b7372820e939b67e9ab4d6f94 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -677,7 +677,8 @@ willPositionSheet:(NSWindow*)sheet
       // Leaving wantsLayer on for the duration of presentation mode causes
       // performance issues when the dropdown is animated in/out.  It also does
       // not seem to be required for the exit animation.
-      [[[self window] cr_windowView] setWantsLayer:YES];
+      windowViewWantsLayer_ = [[[self window] cr_windowView] wantsLayer];
+      [[[self window] cr_windowView] cr_setWantsLayer:YES];

[ccameron, 2014/08/19 01:08:25]

cr_setWantsLayer is dead now.

[erikchen, 2014/08/19 01:10:51]

Done.

     }
     NSView* contentView = [[self window] contentView];
     [presentationModeController_ enterPresentationModeForContentView:contentView
@@ -900,7 +901,7 @@ willPositionSheet:(NSWindow*)sheet
 
   [self showFullscreenExitBubbleIfNecessary];
   browser_->WindowFullscreenStateChanged();
-  [[[self window] cr_windowView] setWantsLayer:NO];
+  [[[self window] cr_windowView] cr_setWantsLayer:windowViewWantsLayer_];
   [self updateRoundedBottomCorners];
 }