Fix compile warnings in Panel.xib

chrome/browser/ui/panels/panel_window_controller_cocoa.h

 // Copyright (c) 2012 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_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_
 
 // A class acting as the Objective-C controller for the Panel window
 // object. Handles interactions between Cocoa and the cross-platform
 // code. Each window has a single titlebar and is managed/owned by Panel.
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/cocoa_protocols.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #import "chrome/browser/ui/cocoa/browser_command_executor.h"
 #import "chrome/browser/ui/cocoa/chrome_browser_window.h"
 #import "chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #import "chrome/browser/ui/cocoa/tracking_area.h"
 #include "chrome/browser/ui/panels/panel.h"
 
 @class FindBarCocoaController;
 class PanelBrowserWindowCocoa;
 @class PanelTitlebarViewCocoa;
 
+@interface PanelWindowCocoaImpl : ChromeBrowserWindow {
+  // Panel windows use a higher priority NSWindowLevel to ensure they are always
+  // visible, causing the OS to prefer panel windows when selecting a window
+  // to make the key window. To counter this preference, we override
+  // -[NSWindow:canBecomeKeyWindow] to restrict when the panel can become the
+  // key window to a limited set of scenarios, such as when cycling through
+  // windows, when panels are the only remaining windows, when an event
+  // triggers window activation, etc. The panel may also be prevented from
+  // becoming the key window, regardless of the above scenarios, such as when
+  // a panel is minimized.
+  BOOL canBecomeKey_;  // Defaults to NO.
+}
+@end
+
 @interface PanelWindowControllerCocoa : NSWindowController
                                             <NSWindowDelegate,
                                              NSAnimationDelegate,
                                              BrowserCommandExecutor> {
  @private
   IBOutlet PanelTitlebarViewCocoa* titlebar_view_;
   scoped_ptr<PanelBrowserWindowCocoa> windowShim_;
   scoped_nsobject<NSString> pendingWindowTitle_;
   scoped_nsobject<TabContentsController> contentsController_;
   NSViewAnimation* boundsAnimation_;  // Lifetime controlled manually, needs
@@ skipping 105 matching lines @@
 // Turns on user-resizable corners/sides indications and enables live resize.
 - (void)enableResizeByMouse:(BOOL)enable;
 
 // In certain cases (when in a Docked strip for example) we want
 // the standard behavior of activating the app when clicking on the titlebar
 // to be disabled. This way, user can minimize the panel w/o activating it.
 - (BOOL)isActivationByClickingTitlebarEnabled;
 @end  // @interface PanelWindowController
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_