base: Change DCHECK_IS_ON to a macro DCHECK_IS_ON().

cc/trees/tree_synchronizer.cc

Index: cc/trees/tree_synchronizer.cc
diff --git a/cc/trees/tree_synchronizer.cc b/cc/trees/tree_synchronizer.cc
index d17f0175b9d9cbd10491b57ba632814760366246..fd2963bdb4408242980238ae15854563f91c7202 100644
--- a/cc/trees/tree_synchronizer.cc
+++ b/cc/trees/tree_synchronizer.cc
@@ -297,7 +297,7 @@ void TreeSynchronizer::PushProperties(Layer* layer,
   size_t num_dependents_need_push_properties = 0;
   PushPropertiesInternal(
       layer, layer_impl, &num_dependents_need_push_properties);
-#if DCHECK_IS_ON
+#if !DCHECK_IS_OFF
   CheckScrollAndClipPointersRecursive(layer, layer_impl);
 #endif
 }