Remove DCHECKs in SurfaceManager::RegisterFrameSinkHierarchy

cc/surfaces/surface_manager.cc

Index: cc/surfaces/surface_manager.cc
diff --git a/cc/surfaces/surface_manager.cc b/cc/surfaces/surface_manager.cc
index 981d7d74c095d66bcab633460cce9fe3562c159b..7eeb692e84acceb46a2321596107d2c3b66c2982 100644
--- a/cc/surfaces/surface_manager.cc
+++ b/cc/surfaces/surface_manager.cc
@@ -489,9 +489,6 @@ bool SurfaceManager::ChildContains(
 void SurfaceManager::RegisterFrameSinkHierarchy(
     const FrameSinkId& parent_frame_sink_id,
     const FrameSinkId& child_frame_sink_id) {
-  DCHECK_EQ(valid_frame_sink_ids_.count(parent_frame_sink_id), 1u);
-  DCHECK_EQ(valid_frame_sink_ids_.count(child_frame_sink_id), 1u);
-
   // If it's possible to reach the parent through the child's descendant chain,
   // then this will create an infinite loop.  Might as well just crash here.
   CHECK(!ChildContains(child_frame_sink_id, parent_frame_sink_id));