Remove unused Zone argument from InitializeAstVisitor

src/codegen.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/codegen.h"
 
 #if defined(V8_OS_AIX)
 #include <fenv.h>  // NOLINT(build/c++11)
 #endif
 #include "src/bootstrapper.h"
@@ skipping 110 matching lines @@
   }
 
   if (FLAG_trace_codegen || print_source || print_ast) {
     base::SmartArrayPointer<char> name = info->GetDebugName();
     PrintF("[generating %s code for %s function: %s]", kind, ftype, name.get());
   }
 
 #ifdef DEBUG
   if (info->parse_info() && print_source) {
     PrintF("--- Source from AST ---\n%s\n",
-           PrettyPrinter(info->isolate(), info->zone())
-               .PrintProgram(info->literal()));
+           PrettyPrinter(info->isolate()).PrintProgram(info->literal()));
   }
 
   if (info->parse_info() && print_ast) {
-    PrintF("--- AST ---\n%s\n", AstPrinter(info->isolate(), info->zone())
-                                    .PrintProgram(info->literal()));
+    PrintF("--- AST ---\n%s\n",
+           AstPrinter(info->isolate()).PrintProgram(info->literal()));
   }
 #endif  // DEBUG
 }
 
 
 Handle<Code> CodeGenerator::MakeCodeEpilogue(MacroAssembler* masm,
                                              CompilationInfo* info) {
   Isolate* isolate = info->isolate();
 
   Code::Flags flags;
@@ skipping 76 matching lines @@
       os << "source_position = " << literal->start_position() << "\n";
     }
     code->Disassemble(debug_name.get(), os);
     os << "--- End code ---\n";
   }
 #endif  // ENABLE_DISASSEMBLER
 }
 
 }  // namespace internal
 }  // namespace v8