Remove some usages of AsyncExtensionFunction::results_.

extensions/browser/extension_function.cc

Index: extensions/browser/extension_function.cc
diff --git a/extensions/browser/extension_function.cc b/extensions/browser/extension_function.cc
index c9a76ac5a8361b5e4c50501406d41b37dd27669e..548153710550e3e388f154ae1092651d1b7def8e 100644
--- a/extensions/browser/extension_function.cc
+++ b/extensions/browser/extension_function.cc
@@ -153,6 +153,13 @@ class RespondLaterAction : public ExtensionFunction::ResponseActionObject {
   void Execute() override {}
 };
 
+class AlreadyRespondedAction : public ExtensionFunction::ResponseActionObject {
+ public:
+  ~AlreadyRespondedAction() override {}
+
+  void Execute() override {}
+};
+
 // Used in implementation of ScopedUserGestureForTests.
 class UserGestureForTests {
  public:
@@ -393,6 +400,12 @@ ExtensionFunction::ResponseAction ExtensionFunction::RespondLater() {
   return ResponseAction(new RespondLaterAction());
 }
 
+ExtensionFunction::ResponseAction ExtensionFunction::AlreadyResponded() {
+  DCHECK(did_respond()) << "ExtensionFunction did not call Respond(),"
+                           " but Run() returned AlreadyResponded()";
+  return ResponseAction(new AlreadyRespondedAction());
+}
+
 // static
 ExtensionFunction::ResponseAction ExtensionFunction::ValidationFailure(
     ExtensionFunction* function) {