Consolidate SDK forwards in sdk_forward_declarations.h.

chrome/browser/fullscreen_mac.mm

 // Copyright (c) 2011 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/fullscreen.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/command_line.h"
 #include "base/mac/mac_util.h"
+#include "base/mac/sdk_forward_declarations.h"
 #include "chrome/common/chrome_switches.h"
 
-// Replicate specific 10.7 SDK declarations for building with prior SDKs.
-#if !defined(MAC_OS_X_VERSION_10_7) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
-
-enum {
-  NSApplicationPresentationFullScreen = 1 << 10
-};
-
-#endif  // MAC_OS_X_VERSION_10_7
-
 bool IsFullScreenMode() {
   // Check if the main display has been captured (by games in particular).
   if (CGDisplayIsCaptured(CGMainDisplayID()))
     return true;
 
   NSApplicationPresentationOptions options =
       [NSApp currentSystemPresentationOptions];
 
   bool dock_hidden = (options & NSApplicationPresentationHideDock) ||
                      (options & NSApplicationPresentationAutoHideDock);
@@ skipping 18 matching lines @@
 bool SupportsSystemFullscreen() {
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kDisableSystemFullscreenForTesting))
     return false;
 
   return base::mac::IsOSLionOrLater();
 }
 
 }  // namespace mac
 }  // namespace chrome