Consolidate SDK forwards in sdk_forward_declarations.h.

base/mac/mac_util.mm

Index: base/mac/mac_util.mm
diff --git a/base/mac/mac_util.mm b/base/mac/mac_util.mm
index c2565991abb42bae82dab2e94d55598d2971aaa6..5f08a44928e6342b88cce4896596a099c79a117d 100644
--- a/base/mac/mac_util.mm
+++ b/base/mac/mac_util.mm
@@ -20,6 +20,7 @@
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_ioobject.h"
 #include "base/mac/scoped_nsobject.h"
+#include "base/mac/sdk_forward_declarations.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/sys_string_conversions.h"
@@ -27,16 +28,6 @@
 namespace base {
 namespace mac {
 
-// 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
-
 namespace {
 
 // The current count of outstanding requests for full screen mode from browser