Consolidate SDK forwards in sdk_forward_declarations.h.

device/bluetooth/bluetooth_adapter_mac.mm

Index: device/bluetooth/bluetooth_adapter_mac.mm
diff --git a/device/bluetooth/bluetooth_adapter_mac.mm b/device/bluetooth/bluetooth_adapter_mac.mm
index 6fb2b44e6cc072fb0ad8fe01bf0dd41ee29f1d73..4ae791009978fbee0fb889f7024b56ed80424f1f 100644
--- a/device/bluetooth/bluetooth_adapter_mac.mm
+++ b/device/bluetooth/bluetooth_adapter_mac.mm
@@ -14,6 +14,7 @@
 #include "base/compiler_specific.h"
 #include "base/containers/hash_tables.h"
 #include "base/location.h"
+#include "base/mac/sdk_forward_declarations.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/sequenced_task_runner.h"
 #include "base/single_thread_task_runner.h"
@@ -24,26 +25,6 @@
 #include "device/bluetooth/bluetooth_socket_mac.h"
 #include "device/bluetooth/bluetooth_uuid.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
-
-@interface IOBluetoothHostController (LionSDKDeclarations)
-- (NSString*)nameAsString;
-- (BluetoothHCIPowerState)powerState;
-@end
-
-@protocol IOBluetoothDeviceInquiryDelegate
-- (void)deviceInquiryStarted:(IOBluetoothDeviceInquiry*)sender;
-- (void)deviceInquiryDeviceFound:(IOBluetoothDeviceInquiry*)sender
-                          device:(IOBluetoothDevice*)device;
-- (void)deviceInquiryComplete:(IOBluetoothDeviceInquiry*)sender
-                        error:(IOReturn)error
-                      aborted:(BOOL)aborted;
-@end
-
-#endif  // MAC_OS_X_VERSION_10_7
-
 @interface BluetoothAdapterMacDelegate
     : NSObject <IOBluetoothDeviceInquiryDelegate> {
  @private