Consolidate SDK forwards in sdk_forward_declarations.h.

content/shell/browser/shell_mac.mm

 // Copyright 2013 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 "content/shell/browser/shell.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #import "base/mac/scoped_nsobject.h"
+#include "base/mac/sdk_forward_declarations.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/sys_string_conversions.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/web_contents.h"
 #include "content/shell/app/resource.h"
 #import "ui/base/cocoa/underlay_opengl_hosting_window.h"
 #include "url/gurl.h"
 
-#if !defined(MAC_OS_X_VERSION_10_7) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
-
-enum {
-  NSWindowCollectionBehaviorFullScreenPrimary = 1 << 7,
-  NSWindowCollectionBehaviorFullScreenAuxiliary = 1 << 8
-};
-
-#endif // MAC_OS_X_VERSION_10_7
-
 // Receives notification that the window is closing so that it can start the
 // tear-down process. Is responsible for deleting itself when done.
 @interface ContentShellWindowDelegate : NSObject<NSWindowDelegate> {
  @private
   content::Shell* shell_;
 }
 - (id)initWithShell:(content::Shell*)shell;
 @end
 
 @implementation ContentShellWindowDelegate
@@ skipping 304 matching lines @@
         [[event.os_event characters] isEqual:@"l"]) {
       [window_ makeFirstResponder:url_edit_view_];
       return;
     }
 
     [[NSApp mainMenu] performKeyEquivalent:event.os_event];
   }
 }
 
 }  // namespace content