[Extensions] Remove SyncIOThreadExtensionFunction

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 49a005bf93f39ce8f7b50488e846c499cfbffbf3..255f2c63abaf35e497bae1096df7a8b1ba038b95 100644
--- a/extensions/browser/extension_function.cc
+++ b/extensions/browser/extension_function.cc
@@ -641,20 +641,3 @@ ExtensionFunction::ResponseAction SyncExtensionFunction::Run() {
 bool SyncExtensionFunction::ValidationFailure(SyncExtensionFunction* function) {
   return false;
 }
-
-SyncIOThreadExtensionFunction::SyncIOThreadExtensionFunction() {
-}
-
-SyncIOThreadExtensionFunction::~SyncIOThreadExtensionFunction() {
-}
-
-ExtensionFunction::ResponseAction SyncIOThreadExtensionFunction::Run() {
-  return RespondNow(RunSync() ? ArgumentList(std::move(results_))
-                              : Error(error_));
-}
-
-// static
-bool SyncIOThreadExtensionFunction::ValidationFailure(
-    SyncIOThreadExtensionFunction* function) {
-  return false;
-}