ui: Cleanup class/struct forward declarations

device/bluetooth/test/mock_bluetooth_cbperipheral_mac.mm

Index: device/bluetooth/test/mock_bluetooth_cbperipheral_mac.mm
diff --git a/device/bluetooth/test/mock_bluetooth_cbperipheral_mac.mm b/device/bluetooth/test/mock_bluetooth_cbperipheral_mac.mm
index f39d77f86525fbd76c288bf16d97771b3f33c371..ce195f01b282b2df55333356f9d50181c4c18dbe 100644
--- a/device/bluetooth/test/mock_bluetooth_cbperipheral_mac.mm
+++ b/device/bluetooth/test/mock_bluetooth_cbperipheral_mac.mm
@@ -141,16 +141,9 @@ using base::scoped_nsobject;
 }
 
 - (void)didModifyServices:(NSArray*)invalidatedServices {
-  // -[CBPeripheralDelegate peripheral:didModifyServices:] is only available
-  // with 10.9. It is safe to call this method (even if chrome is running on
-  // 10.8) since WebBluetooth is enabled only with 10.10.
-  // TODO(crbug.com/653056)
   DCHECK(
       [_delegate respondsToSelector:@selector(peripheral:didModifyServices:)]);
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wpartial-availability"
   [_delegate peripheral:self.peripheral didModifyServices:invalidatedServices];
-#pragma clang diagnostic pop
 }
 
 - (NSUUID*)identifier {