Remove NGBlockNode constructor, SetFirstChild, SetNextSibling methods

third_party/WebKit/Source/core/layout/ng/ng_constraint_space.cc

Index: third_party/WebKit/Source/core/layout/ng/ng_constraint_space.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.cc b/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.cc
index 5a1abf690a32b83b879a9620ae4030864001183c..1f3c4d01136612d5d0e3b0ead30f3940b26eb9aa 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.cc
@@ -103,6 +103,10 @@ NGConstraintSpace* NGConstraintSpace::CreateFromLayoutObject(
   NGPhysicalSize initial_containing_block_size{
       LayoutUnit(icb_float_size.width()), LayoutUnit(icb_float_size.height())};
 
+  // ICB cannot be indefinite by the spec.
+  DCHECK_GE(initial_containing_block_size.width, LayoutUnit());
+  DCHECK_GE(initial_containing_block_size.height, LayoutUnit());
+
   return NGConstraintSpaceBuilder(writing_mode)
       .SetAvailableSize(available_size)
       .SetPercentageResolutionSize(percentage_size)