Revert of [LayoutNG] Remove simple constructors from NGPhysicalConstraintSpace.

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

Index: third_party/WebKit/Source/core/layout/ng/ng_physical_constraint_space.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_physical_constraint_space.cc b/third_party/WebKit/Source/core/layout/ng/ng_physical_constraint_space.cc
index 567ed676320a6625e8cac1805e738dbce33c5f8c..867519f34c581e4ff7ea4d798886cd2ede848eaa 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_physical_constraint_space.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_physical_constraint_space.cc
@@ -24,6 +24,24 @@
       height_direction_fragmentation_type_(height_direction_fragmentation_type),
       is_new_fc_(is_new_fc) {}
 
+NGPhysicalConstraintSpace::NGPhysicalConstraintSpace(
+    NGPhysicalSize container_size)
+    : container_size_(container_size),
+      fixed_width_(0),
+      fixed_height_(0),
+      width_direction_triggers_scrollbar_(0),
+      height_direction_triggers_scrollbar_(0),
+      width_direction_fragmentation_type_(FragmentNone),
+      height_direction_fragmentation_type_(FragmentNone) {}
+
+NGPhysicalConstraintSpace::NGPhysicalConstraintSpace()
+    : fixed_width_(0),
+      fixed_height_(0),
+      width_direction_triggers_scrollbar_(0),
+      height_direction_triggers_scrollbar_(0),
+      width_direction_fragmentation_type_(FragmentNone),
+      height_direction_fragmentation_type_(FragmentNone) {}
+
 void NGPhysicalConstraintSpace::AddExclusion(const NGExclusion* exclusion,
                                              unsigned options) {
   exclusions_.append(exclusion);