Revert of Fix the handling of user gestures for external protocol handler dialogs.

extensions/browser/extension_function_dispatcher.cc

Index: extensions/browser/extension_function_dispatcher.cc
diff --git a/extensions/browser/extension_function_dispatcher.cc b/extensions/browser/extension_function_dispatcher.cc
index 4ac6349d5bc6941a1299fb5970b7d01cbdb8ba85..e5ab1e4e73fa1e670a20de8358284f5c080be743 100644
--- a/extensions/browser/extension_function_dispatcher.cc
+++ b/extensions/browser/extension_function_dispatcher.cc
@@ -382,6 +382,8 @@
   if (violation_error.empty()) {
     scoped_ptr<base::ListValue> args(params.arguments.DeepCopy());
 
+    // See crbug.com/39178.
+    ExtensionsBrowserClient::Get()->PermitExternalProtocolHandler();
     NotifyApiFunctionCalled(
         extension->id(), params.name, args.Pass(), browser_context_);
     function->Run();