Mac: Enable help when there are no windows.

chrome/browser/browser.h

 // Copyright (c) 2006-2009 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_BROWSER_H_
 #define CHROME_BROWSER_BROWSER_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 137 matching lines @@
   static void OpenEmptyWindow(Profile* profile);
 
   // Opens a new window with the tabs from |profile|'s TabRestoreService.
   static void OpenWindowWithRestoredTabs(Profile* profile);
 
   // Opens the specified URL in a new browser window in an incognito session.
   // If there is already an existing active incognito session for the specified
   // |profile|, that session is re-used.
   static void OpenURLOffTheRecord(Profile* profile, const GURL& url);
 
-  // Opens the a new application ("thin frame") window for the specified url.
+  // Opens a new application ("thin frame") window for the specified url.
   static void OpenApplicationWindow(Profile* profile, const GURL& url);
 
+#if defined(OS_MACOSX)
+  // Open a new window with help (needed on Mac when there are no windows).
+  static void OpenHelpWindow(Profile* profile);
+#endif
+
   // State Storage and Retrieval for UI ///////////////////////////////////////
 
   // Save and restore the window position.
   std::wstring GetWindowPlacementKey() const;
   bool ShouldSaveWindowPlacement() const;
   void SaveWindowPlacement(const gfx::Rect& bounds, bool maximized);
   gfx::Rect GetSavedWindowBounds() const;
   bool GetSavedMaximizedState() const;
 
   // Gets the FavIcon of the page in the selected tab.
@@ skipping 626 matching lines @@
   // Dialog box used for opening and saving files.
   scoped_refptr<SelectFileDialog> select_file_dialog_;
 
   // Keep track of the encoding auto detect pref.
   BooleanPrefMember encoding_auto_detect_;
 
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_H_