[parser] Refactor AstTraversalVisitor (BROKEN)

BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 819 matching lines @@
     "src/asmjs/asm-types.cc",
     "src/asmjs/asm-types.h",
     "src/asmjs/asm-wasm-builder.cc",
     "src/asmjs/asm-wasm-builder.h",
     "src/assembler.cc",
     "src/assembler.h",
     "src/assert-scope.cc",
     "src/assert-scope.h",
     "src/ast/ast-expression-rewriter.cc",
     "src/ast/ast-expression-rewriter.h",
-    "src/ast/ast-expression-visitor.cc",
-    "src/ast/ast-expression-visitor.h",
     "src/ast/ast-literal-reindexer.cc",
     "src/ast/ast-literal-reindexer.h",
     "src/ast/ast-numbering.cc",
     "src/ast/ast-numbering.h",
     "src/ast/ast-type-bounds.h",
     "src/ast/ast-value-factory.cc",
     "src/ast/ast-value-factory.h",
     "src/ast/ast.cc",
     "src/ast/ast.h",
     "src/ast/modules.cc",
@@ skipping 1632 matching lines @@
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs = [ ":internal_config" ]
 }
 
 v8_fuzzer("wasm_asmjs_fuzzer") {
 }