Remove all the OS X 10.6 SDK forward declarations.

chrome/browser/ui/cocoa/browser_window_controller_private.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.
 
 #import "chrome/browser/ui/cocoa/browser_window_controller_private.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #import "base/memory/scoped_nsobject.h"
@@ skipping 26 matching lines @@
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 #import "ui/base/cocoa/focus_tracker.h"
 #include "ui/base/ui_base_types.h"
 
 using content::RenderWidgetHostView;
 using content::WebContents;
 
-// Forward-declare symbols that are part of the 10.6 SDK.
-#if !defined(MAC_OS_X_VERSION_10_6) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
-
-enum {
-  NSApplicationPresentationDefault                    = 0,
-  NSApplicationPresentationAutoHideDock               = (1 <<  0),
-  NSApplicationPresentationHideDock                   = (1 <<  1),
-  NSApplicationPresentationAutoHideMenuBar            = (1 <<  2),
-  NSApplicationPresentationHideMenuBar                = (1 <<  3),
-};
-typedef NSUInteger NSApplicationPresentationOptions;
-
-#endif  // MAC_OS_X_VERSION_10_6
-
 namespace {
 
 // Space between the incognito badge and the right edge of the window.
 const CGFloat kAvatarRightOffset = 4;
 
 // The amount by which to shrink the tab strip (on the right) when the
 // incognito badge is present.
 const CGFloat kAvatarTabStripShrink = 18;
 
 // Insets for the location bar, used when the full toolbar is hidden.
@@ skipping 810 matching lines @@
 - (void)disableBarVisibilityUpdates {
   // Early escape if there's nothing to do.
   if (!barVisibilityUpdatesEnabled_)
     return;
 
   barVisibilityUpdatesEnabled_ = NO;
   [presentationModeController_ cancelAnimationAndTimers];
 }
 
 @end  // @implementation BrowserWindowController(Private)