base: Change DCHECK_IS_ON to a macro DCHECK_IS_ON().

cc/resources/picture_layer_tiling.cc

Index: cc/resources/picture_layer_tiling.cc
diff --git a/cc/resources/picture_layer_tiling.cc b/cc/resources/picture_layer_tiling.cc
index 2e5b45729f8f4860687f3a13361e1fccffb7b869..8f1ad8630c2dfc53d4f3ef043e10f4536b8f2b3d 100644
--- a/cc/resources/picture_layer_tiling.cc
+++ b/cc/resources/picture_layer_tiling.cc
@@ -195,7 +195,7 @@ void PictureLayerTiling::CloneTilesAndPropertiesFrom(
   }
 
   DCHECK_EQ(twin_tiling.tiles_.size(), tiles_.size());
-#if DCHECK_IS_ON
+#if !DCHECK_IS_OFF
   for (const auto& tile_map_pair : tiles_)
     DCHECK(tile_map_pair.second->is_shared());
   VerifyLiveTilesRect(false);
@@ -694,7 +694,7 @@ void PictureLayerTiling::SetLiveTilesRect(
 }
 
 void PictureLayerTiling::VerifyLiveTilesRect(bool is_on_recycle_tree) const {
-#if DCHECK_IS_ON
+#if !DCHECK_IS_OFF
   for (auto it = tiles_.begin(); it != tiles_.end(); ++it) {
     if (!it->second.get())
       continue;