Remove all the OS X 10.6 SDK forward declarations.

webkit/glue/webmenurunner_mac.mm

 // 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.
 
 #include "webkit/glue/webmenurunner_mac.h"
 
 #include "base/sys_string_conversions.h"
 
-#if !defined(MAC_OS_X_VERSION_10_6) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
-enum {
-  NSUserInterfaceLayoutDirectionLeftToRight = 0,
-  NSUserInterfaceLayoutDirectionRightToLeft = 1
-};
-typedef NSInteger NSUserInterfaceLayoutDirection;
-
-@interface NSCell (SnowLeopardSDKDeclarations)
-- (void)setUserInterfaceLayoutDirection:
-    (NSUserInterfaceLayoutDirection)layoutDirection;
-@end
-
-enum {
-  NSTextWritingDirectionEmbedding = (0 << 1),
-  NSTextWritingDirectionOverride = (1 << 1)
-};
-
-static NSString* NSWritingDirectionAttributeName = @"NSWritingDirection";
-#endif
-
 @interface WebMenuRunner (PrivateAPI)
 
 // Worker function used during initialization.
 - (void)addItem:(const WebMenuItem&)item;
 
 // A callback for the menu controller object to call when an item is selected
 // from the menu. This is not called if the menu is dismissed without a
 // selection.
 - (void)menuItemSelected:(id)sender;
 
@@ skipping 119 matching lines @@
 
   if ([self menuItemWasChosen])
     index_ = [cell indexOfSelectedItem];
 }
 
 - (int)indexOfSelectedItem {
   return index_;
 }
 
 @end  // WebMenuRunner