Separate DuplicateFinder from Scanner.

src/parsing/parser.cc

 // Copyright 2012 the V8 project 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 "src/parsing/parser.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/ast/ast-expression-rewriter.h"
 #include "src/ast/ast-literal-reindexer.h"
 #include "src/ast/ast-traversal-visitor.h"
 #include "src/ast/ast.h"
 #include "src/bailout-reason.h"
 #include "src/base/platform/platform.h"
 #include "src/char-predicates-inl.h"
 #include "src/messages.h"
+#include "src/parsing/duplicate-finder.h"
 #include "src/parsing/parameter-initializer-rewriter.h"
 #include "src/parsing/parse-info.h"
 #include "src/parsing/rewriter.h"
 #include "src/parsing/scanner-character-streams.h"
 #include "src/runtime/runtime.h"
 #include "src/string-stream.h"
 #include "src/tracing/trace-event.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 6813 matching lines @@
   node->Print(Isolate::Current());
 }
 #endif  // DEBUG
 
 #undef CHECK_OK
 #undef CHECK_OK_VOID
 #undef CHECK_FAILED
 
 }  // namespace internal
 }  // namespace v8