Consolidate SDK forwards in sdk_forward_declarations.h.

chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac_unittest.mm

Index: chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac_unittest.mm
diff --git a/chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac_unittest.mm b/chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac_unittest.mm
index d4d3f17da49bf00e71aabb6868e1a5ab861bb919..17c23adeb1f8acc57ce61964ffea5b7728d853bb 100644
--- a/chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac_unittest.mm
+++ b/chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac_unittest.mm
@@ -11,6 +11,7 @@
 #include "base/mac/cocoa_protocols.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
+#include "base/mac/sdk_forward_declarations.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/sys_string_conversions.h"
@@ -24,19 +25,6 @@
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-#if !defined(MAC_OS_X_VERSION_10_7) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
-
-@interface NSObject (ICCameraDeviceDelegateLionAPI)
-- (void)deviceDidBecomeReadyWithCompleteContentCatalog:(ICDevice*)device;
-- (void)didDownloadFile:(ICCameraFile*)file
-                  error:(NSError*)error
-                options:(NSDictionary*)options
-            contextInfo:(void*)contextInfo;
-@end
-
-#endif  // 10.6
-
 namespace {
 
 const char kDeviceId[] = "id";