Ensure the previously active browser window gets the focus after a browser window is closed on OSX.

chrome/browser/ui/cocoa/browser_window_utils.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_UTILS_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_UTILS_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
@@ skipping 21 matching lines @@
 // a matching window and title. This function returns a NSString* that can be
 // passed in future calls as oldTitle.
 + (NSString*)scheduleReplaceOldTitle:(NSString*)oldTitle
                         withNewTitle:(NSString*)newTitle
                            forWindow:(NSWindow*)window;
 
 + (NSPoint)themePatternPhaseFor:(NSView*)windowView
                    withTabStrip:(NSView*)tabStripView;
 
 + (void)activateWindowForController:(NSWindowController*)controller;
+
+// Some browser windows (Panels) use a different NSWindowLevel, causing the
+// system to prefer them over other windows when selecting the next window
+// to give focus to after a browser window is closed.
+// This method selects the previous active browser window instead.
+// |closedBrowser| is the browser that is being closed. Used to ensure it
+// is excluded from the selection process.
+// Does nothing if no previous active window is found.
++ (void)selectPreviousActiveBrowserWindow:(Browser*)closedBrowser;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_UTILS_H_