[LayoutNG] Cleanup: de-nest PlaceOutOfFLowObjects.

There should be no behaviour change.

Change-Id: I32389eb3b05a6935e320fa3d871d27c3eead2c73
Reviewed-on: https://chromium-review.googlesource.com/c/1353948Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611839}

third_party/blink/renderer/core/layout/ng/inline/ng_inline_layout_algorithm.cc

@@ -497,7 +497,10 @@ void NGInlineLayoutAlgorithm::PlaceOutOfFlowObjects(
   TextDirection line_direction = line_info.BaseDirection();
 
   for (NGLineBoxFragmentBuilder::Child& child : line_box_) {
-    if (LayoutObject* box = child.out_of_flow_positioned_box) {
+    LayoutObject* box = child.out_of_flow_positioned_box;
+    if (!box)
+      continue;
+
     // The static position is at the line-top. Ignore the block_offset.
     NGLogicalOffset static_offset(child.offset.inline_offset, LayoutUnit());
 
@@ -516,29 +519,25 @@ void NGInlineLayoutAlgorithm::PlaceOutOfFlowObjects(
 
       inline_offset += line_info.TextIndent();
 
-        // We need to subtract the line offset, in order to ignore
-        // floats and text-indent.
+      // We need to subtract the line offset, in order to ignore floats and
+      // text-indent.
       static_offset.inline_offset = -inline_offset;
 
       if (child.offset.inline_offset && !line_box_metrics.IsEmpty())
         static_offset.block_offset = line_box_metrics.LineHeight();
-      } else {
+    } else if (IsRtl(line_direction)) {
       // Our child offset is line-relative, but the static offset is
       // flow-relative, using the direction we give to
       // |AddInlineOutOfFlowChildCandidate|.
-        if (IsRtl(line_direction)) {
-          static_offset.inline_offset =
-              inline_size - static_offset.inline_offset;
-        }
+      static_offset.inline_offset = inline_size - static_offset.inline_offset;
     }
 
     container_builder_.AddInlineOutOfFlowChildCandidate(
         NGBlockNode(ToLayoutBox(box)), static_offset, line_direction,
         child.out_of_flow_containing_box);
 
-      child.out_of_flow_positioned_box = child.out_of_flow_containing_box =
-          nullptr;
-    }
+    child.out_of_flow_positioned_box = nullptr;
+    child.out_of_flow_containing_box = nullptr;
   }
 }