[Mac] Remove BrowserCommandExecutor protocol.

chrome/browser/global_keyboard_shortcuts_mac.h

 // Copyright (c) 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_GLOBAL_KEYBOARD_SHORTCUTS_MAC_H_
 #define CHROME_BROWSER_GLOBAL_KEYBOARD_SHORTCUTS_MAC_H_
 
+#include <Carbon/Carbon.h>  // For unichar.
+
 #include "base/basictypes.h"
 
+@class NSEvent;
+
 struct KeyboardShortcutData {
   bool command_key;
   bool shift_key;
   bool cntrl_key;
   bool opt_key;
   // Either one of vkey_code or key_char must be specified.  For keys
   // whose virtual key code is hardware-dependent (kVK_ANSI_*) key_char
   // should be specified instead.
   // Set 0 for the one you do not want to specify.
   int vkey_code;  // Virtual Key code for the command.
@@ skipping 55 matching lines @@
 unichar KeyCharacterForEvent(NSEvent* event);
 
 // For testing purposes.
 const KeyboardShortcutData* GetWindowKeyboardShortcutTable(size_t* num_entries);
 const KeyboardShortcutData*
     GetDelayedWindowKeyboardShortcutTable(size_t* num_entries);
 const KeyboardShortcutData*
     GetBrowserKeyboardShortcutTable(size_t* num_entries);
 
 #endif  // #ifndef CHROME_BROWSER_GLOBAL_KEYBOARD_SHORTCUTS_MAC_H_