[LayoutNG] Don't implement ContainerSize() using the physical constraint space.

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 676ad16d00ea592851e80e1fe1a56db102da2bf4..7db295ccd3fdb74db45613bc3c3b4a962968ceb9 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
@@ -32,7 +32,13 @@ NGConstraintSpace::NGConstraintSpace(NGWritingMode writing_mode,
     : physical_space_(constraint_space->PhysicalSpace()),
       offset_(constraint_space->Offset()),
       size_(constraint_space->Size()),
-      writing_mode_(writing_mode) {}
+      writing_mode_(writing_mode) {
+  if (writing_mode != constraint_space->WritingMode()) {
+    // TODO(layout-ng): Need to convert offset_ too.
+    size_ = size_.ConvertToWritingMode(constraint_space->WritingMode(),
+                                       writing_mode);
+  }
+}
 
 NGConstraintSpace::NGConstraintSpace(NGWritingMode writing_mode,
                                      const NGConstraintSpace& other,
@@ -83,11 +89,6 @@ NGConstraintSpace* NGConstraintSpace::CreateFromLayoutObject(
   return derived_constraint_space;
 }
 
-NGLogicalSize NGConstraintSpace::ContainerSize() const {
-  return physical_space_->container_size_.ConvertToLogical(
-      static_cast<NGWritingMode>(writing_mode_));
-}
-
 bool NGConstraintSpace::InlineTriggersScrollbar() const {
   return writing_mode_ == HorizontalTopBottom
              ? physical_space_->width_direction_triggers_scrollbar_