Remove redundant casts, use NGLayoutInputNode base functions everywhere

third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm_test.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_block_layout_algorithm.h"
 
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/TagCollection.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/ng/layout_ng_block_flow.h"
@@ skipping 621 matching lines @@
 
   ASSERT_EQ(frag->Children().size(), 1UL);
 
   // div1
   const NGPhysicalFragment* child = frag->Children()[0].get();
   EXPECT_EQ(kBorderLeft + kPaddingLeft + kWidth + kPaddingRight + kBorderRight,
             child->Width());
   EXPECT_EQ(kBorderTop + kPaddingTop + kHeight + kPaddingBottom + kBorderBottom,
             child->Height());
 
-  ASSERT_TRUE(child->Type() == NGPhysicalFragment::kFragmentBox);
+  ASSERT_TRUE(child->IsBox());
   ASSERT_EQ(static_cast<const NGPhysicalBoxFragment*>(child)->Children().size(),
             1UL);
 
   // div2
   child = static_cast<const NGPhysicalBoxFragment*>(child)->Children()[0].get();
   EXPECT_EQ(kBorderTop + kPaddingTop, child->TopOffset());
   EXPECT_EQ(kBorderLeft + kPaddingLeft, child->LeftOffset());
 }
 
 TEST_F(NGBlockLayoutAlgorithmTest, PercentageResolutionSize) {
@@ skipping 1556 matching lines @@
 
   child = iterator.NextChild();
   EXPECT_EQ(NGPhysicalSize(LayoutUnit(150), LayoutUnit(100)), child->Size());
   EXPECT_EQ(NGPhysicalOffset(LayoutUnit(0), LayoutUnit(40)), child->Offset());
 
   EXPECT_FALSE(iterator.NextChild());
 }
 
 }  // namespace
 }  // namespace blink