Consistently start (almost) all AstPrinter::VisitFoo functions with IndentedScope.

src/prettyprinter.h

Index: src/prettyprinter.h
diff --git a/src/prettyprinter.h b/src/prettyprinter.h
index 41175ab2ae2282c8d8f5996d2769316adf8860ae..6657ecd1458236793ab74fec3a09a11363f8b78c 100644
--- a/src/prettyprinter.h
+++ b/src/prettyprinter.h
@@ -106,7 +106,7 @@ class AstPrinter: public PrettyPrinter {
   void PrintLiteralWithModeIndented(const char* info,
                                     Variable* var,
                                     Handle<Object> value);
-  void PrintLabelsIndented(const char* info, ZoneStringList* labels);
+  void PrintLabelsIndented(ZoneStringList* labels);
 
   void inc_indent() { indent_++; }
   void dec_indent() { indent_--; }