[es8] Initial set of changes to support syntactic tail calls.

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index 3df630a4efd20b9e4c5b8aa87e1f711e2c34c0bf..b429fbef3f329949682e76bbafc2c358d7142ad4 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -920,8 +920,6 @@ class Parser : public ParserBase<ParserTraits> {
   Statement* ParseForStatement(ZoneList<const AstRawString*>* labels, bool* ok);
   Statement* ParseThrowStatement(bool* ok);
   Expression* MakeCatchContext(Handle<String> id, VariableProxy* value);
-  class DontCollectExpressionsInTailPositionScope;
-  class CollectExpressionsInTailPositionToListScope;
   TryStatement* ParseTryStatement(bool* ok);
   DebuggerStatement* ParseDebuggerStatement(bool* ok);
   // Parse a SubStatement in strict mode, or with an extra block scope in