Revert async changes.

runtime/vm/parser.h

Index: runtime/vm/parser.h
diff --git a/runtime/vm/parser.h b/runtime/vm/parser.h
index b2fbfe64f738404fcdd7f834e1e90183c2e39638..bd7c3d2e384e0452c93fa7b7f51ad32c5d553639 100644
--- a/runtime/vm/parser.h
+++ b/runtime/vm/parser.h
@@ -363,8 +363,6 @@ class Parser : public ValueObject {
   void ParseTopLevelAccessor(TopLevel* top_level, intptr_t metadata_pos);
   RawArray* EvaluateMetadata();
 
-  RawFunction::AsyncModifier ParseFunctionModifier();
-
   // Support for parsing libraries.
   RawObject* CallLibraryTagHandler(Dart_LibraryTag tag,
                                    intptr_t token_pos,
@@ -465,7 +463,6 @@ class Parser : public ValueObject {
                                  Array* default_parameter_values);
   SequenceNode* ParseFunc(const Function& func,
                           Array* default_parameter_values);
-  RawClass* GetClassForAsync(const String& class_name);
 
   void ParseNativeFunctionBlock(const ParamList* params, const Function& func);
 
@@ -486,12 +483,7 @@ class Parser : public ValueObject {
   void OpenBlock();
   void OpenLoopBlock();
   void OpenFunctionBlock(const Function& func);
-  RawFunction* OpenAsyncFunction(intptr_t formal_param_pos);
   SequenceNode* CloseBlock();
-  SequenceNode* CloseAsyncFunction(const Function& closure,
-                                   SequenceNode* closure_node);
-  void CloseAsyncClosure(SequenceNode* body);
-
 
   LocalVariable* LookupPhaseParameter();
   LocalVariable* LookupReceiver(LocalScope* from_scope, bool test_only);