Fix build break from a bad rebase.

services/window_manager/window_manager_app.cc

Index: services/window_manager/window_manager_app.cc
diff --git a/services/window_manager/window_manager_app.cc b/services/window_manager/window_manager_app.cc
index c71c37fcac16074f48c8e77bdd7734995c568039..56dbbc49f99639b83b1ecbf4954c66cd1be606c5 100644
--- a/services/window_manager/window_manager_app.cc
+++ b/services/window_manager/window_manager_app.cc
@@ -56,8 +56,7 @@ WindowManagerApp::WindowManagerApp(
       native_viewport_event_dispatcher_factory_(this),
       wrapped_view_manager_delegate_(view_manager_delegate),
       window_manager_delegate_(window_manager_delegate),
-      root_(nullptr),
-      gesture_provider_(this) {
+      root_(nullptr) {
 }
 
 WindowManagerApp::~WindowManagerApp() {