Fix object header size for baker read barrier.

Change-Id: I2b4a61488b9017d22210d79a07f485f9afef3b42
diff --git a/runtime/mirror/object.h b/runtime/mirror/object.h
index 4ed96fc..1bbcf8e 100644
--- a/runtime/mirror/object.h
+++ b/runtime/mirror/object.h
@@ -62,7 +62,7 @@
 static constexpr bool kCheckFieldAssignments = false;
 
 // Size of Object.
-static constexpr uint32_t kObjectHeaderSize = kUseBrooksReadBarrier ? 16 : 8;
+static constexpr uint32_t kObjectHeaderSize = kUseBakerOrBrooksReadBarrier ? 16 : 8;
 
 // C++ mirror of java.lang.Object
 class MANAGED LOCKABLE Object {