[LayoutNG] Make NGLayoutInputNode::AlgorithmForInputNode() more readable.

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

 // Copyright 2016 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 "core/layout/ng/ng_layout_input_node.h"
 
 #include "core/layout/ng/ng_block_layout_algorithm.h"
 #include "core/layout/ng/ng_block_node.h"
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_inline_node.h"
 #include "core/layout/ng/ng_inline_layout_algorithm.h"
 #include "core/layout/ng/ng_layout_algorithm.h"
 #include "core/layout/ng/ng_legacy_block_layout_algorithm.h"
 #include "core/style/ComputedStyle.h"
 
 namespace blink {
 
 NGLayoutAlgorithm* NGLayoutInputNode::AlgorithmForInputNode(
     NGLayoutInputNode* input_node,
     NGConstraintSpace* constraint_space) {
   // At least for now, this should never be called on LegacyInline
   // children. However, there will be other kinds of input_node so
   // it makes sense to do this here.
   DCHECK(input_node->Type() == kLegacyBlock);
   NGBlockNode* block = toNGBlockNode(input_node);
-
-  if (block->CanUseNewLayout()) {
-    if (block->HasInlineChildren())
-      return new NGInlineLayoutAlgorithm(block->Style(),
-                                         toNGInlineNode(block->FirstChild()),
-                                         constraint_space);
-    return new NGBlockLayoutAlgorithm(
-        block->Style(), toNGBlockNode(block->FirstChild()), constraint_space);
+  if (!block->CanUseNewLayout())
+    return new NGLegacyBlockLayoutAlgorithm(block, constraint_space);
+  const ComputedStyle* style = block->Style();
+  if (block->HasInlineChildren()) {
+    NGInlineNode* child = toNGInlineNode(block->FirstChild());
+    return new NGInlineLayoutAlgorithm(style, child, constraint_space);
   }
-
-  return new NGLegacyBlockLayoutAlgorithm(block, constraint_space);
+  NGBlockNode* child = toNGBlockNode(block->FirstChild());
+  return new NGBlockLayoutAlgorithm(style, child, constraint_space);
 }
 }