Remove redundant casts, use NGLayoutInputNode base functions everywhere

third_party/WebKit/Source/core/layout/ng/ng_physical_text_fragment.h

 // 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.
 
 #ifndef NGPhysicalTextFragment_h
 #define NGPhysicalTextFragment_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_block_node.h"
 #include "core/layout/ng/ng_inline_node.h"
@@ skipping 29 matching lines @@
   // TODO(kojii): NGInlineNode is to access text content and NGLayoutInlineItem.
   // Review if it's better to point them.
   Persistent<const NGInlineNode> node_;
   unsigned item_index_;
   unsigned start_offset_;
   unsigned end_offset_;
 };
 
 DEFINE_TYPE_CASTS(NGPhysicalTextFragment,
                   NGPhysicalFragment,
-                  text,
-                  text->Type() == NGPhysicalFragment::kFragmentText,
-                  text.Type() == NGPhysicalFragment::kFragmentText);
+                  fragment,
+                  fragment->IsText(),
+                  fragment.IsText());
 
 }  // namespace blink
 
 #endif  // NGPhysicalTextFragment_h