Remove DCHECKs in SurfaceManager::RegisterFrameSinkHierarchy

cc/surfaces/surface_manager.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/surfaces/surface_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <queue>
@@ skipping 471 matching lines @@
       return true;
     if (ChildContains(children[i], search_frame_sink_id))
       return true;
   }
   return false;
 }
 
 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));
 
   std::vector<FrameSinkId>& children =
       frame_sink_source_map_[parent_frame_sink_id].children;
   for (size_t i = 0; i < children.size(); ++i)
     DCHECK(children[i] != child_frame_sink_id);
   children.push_back(child_frame_sink_id);
 
@@ skipping 133 matching lines @@
     std::vector<SurfaceId> children(iter->second.begin(), iter->second.end());
     std::sort(children.begin(), children.end());
 
     for (const SurfaceId& child_id : children)
       SurfaceReferencesToStringImpl(child_id, indent + "  ", str);
   }
 }
 #endif  // DCHECK_IS_ON()
 
 }  // namespace cc